Saitama and Genos are returning from the grocery store when they see King, S Class Hero Rank 7. King isn't actually the strongest man alive but a ordinary Otaku who happened to be at the place where monsters were destroyed and was given the credit. He is running from an enemy but Saitama rescues him. King realizes that Saitama had saved him in the past after saving him from being attacked yet again. Afterwards, Saitama plays video games with King while Genos gets upgrades from G4's equipment after defeating the robot. The President of the Hero Association announces that he will be hiring villains; Speed O' Sound Sonic leaves the meeting after discovering Saitama was not present. A man named Garou interrupts the meeting.

During the meeting, Garou insults both the heroes and villains, saying that he is on the side of monsters and declares everyone as his enemy. He beats up everyone except Sitch to send a message. Meanwhile, Saitama is at his house playing video games on the PlayStation Portable he stole from King, and Genos is doing chores when Speed O Sound Sonic shows up at the door trying to find Saitama. While Genos and Sonic fight elsewhere, Fubuki, going by Hellish Blizzard, arrives to invite Saitama to her faction. Failing to convince him, she orders her underlings to attack him, but Saitama easily beats them. Fubuki attacks Saitama with her psychic abilities to no effect. He berates her for surrounding herself with weaker underlings to make herself look stronger, warning Fubuki that she could eventually face a villain stronger than her whole faction. Saitama proclaims that factions are useless, and warns the esper to never insult heroes again. Fubuki ignores his lecture and tries to attack him again, but Saitama sees Sonic and Genos fighting and saves Fubuki from an imminent explosion. Their fight is in stalemate, as Sonic is too fast while Genos is too durable. Genos tries to create a huge explosion, but Saitama knocks Genos down to stop him from destroying Saitama's apartment. Saitama then challenges Sonic, and hilariously surpasses Sonic's shadow clone move with Killer Move: Serious Series Sideway Jumps (by side jumping really fast). Sonic is shocked, and crashes to the ground, badly bruised and defeated. Fubuki watches the whole thing in awe of Saitama defeating such an obviously powerful opponent with ease.

Later in Saitama's apartment, Fubuki reveals she is the younger sister of Tatsumaki, S Class Hero Rank 2. Due to Tatsumaki being overwhelmingly strong compared to her, Fubuki gathers underlings to be stronger. Genos asks why she doesn't strive to be Class A Rank 1, but Fubuki says she can't surpass Amai Mask, the current holder of the position. Elsewhere, Amai Mask brutally kills a monstrous caveman named Suppon, emphasizing her point. Fubuki tries to convince Saitama again to join her faction, but Saitama refuses. Fubuki berates him for being low in the ranking but is shocked when King arrives to retrieve his video game. Saitama tries to explain that he accidentally broke the PSP as well as erased King's saved data. The Hero Association gives Saitama the hero name Bald Cape because of his appearance, while Genos is named Demon Cyborg due to his aggressive attacks. In the closing scene, Garou defeats Tank Top Vegetarian in an alleyway.

At the start of the episode, Silver Fang severely beats and expels his pupil Charanko from his dojo. Charanko goes to Saitama and Genos to understand his master's sudden change in attitude, noticing that King and Fubuki are also in Saitama's apartment. Genos correctly deduces that Charanko was kicked out because of the reappearance of Garou, one of Silver Fang's previous students, and that Bang likely expelled Charanko to keep him out of Garou's way. While walking home one night, Charanko happens upon Garou picking a fight with Mumen Rider, the Class C Rank 1 Hero. Before they could fight however, Tank Top Vegetarian and his crew arrive to confront Garou. Garou easily defeats Tank Top Vegetarian again, but Tank Top Master intervenes. Garou is excited as he gets to fight an S-Class hero for the first time. Tank Top Master gains the upper hand, but before he could deal the finishing blow, Mumen Rider jumps in to take the hit, saying that its wrong for heroes to kill humans. Garou seemingly apologizes for his actions, but Tank Top Master sees through Garou's deception. He lands a strong blow forcing Garou to use his trump card, the Water Stream Rock Smashing Fist, Bang's signature style. With it, he defeats Tank Top Master, Mumen Rider, Charanko and the entire Tank Top gang. Bang calls his brother Bomb to help deal with the Garou threat, and they stumble across the Tank Top's crew's and Charanko's beaten bodies.

The next day, Saitama visits Mumen Rider in the hospital, and learns about Garou's martial arts from Tank Top Master. Garou finds a boy named Tareo who is reading a hero almanac that describes each hero's movesets, and plans to take out Class A Hero: Golden Ball, which he later accomplishes. Meanwhile, Saitama wishes to see what martial arts are about and Charanko gives Saitama a ticket to a mixed-martial arts tournament. He warns Saitama that the tournament will disqualify any impersonators, but Saitama doesn't listen. After beating up a pimp, Garou encounters Saitama, who is planning to buy a wig for the tournament. Mistakenly thinking Saitama wants to fight him, Garou tries to chop Saitama, but his attack has no effect. Annoyed, Saitama chops Garou on the back of the neck, and knocks him out. In the post-credit scene, Genos catches Saitama putting on his wig, so he asks Dr. Kuseno over his phone to implant artificial fibers to give Saitama the appearance of hair, much to Saitama's annoyance.

It is revealed that when Garou was young, he always rooted for the bad guys to win due to the good guys being too popular. When his father tells him that the good guys will always win, Garou finds it unfair to the monsters, finding they were always the ones trying their best to win, but lost because they were seen as "freaks." Unwilling to accept the status quo, Garou resolved to become the strongest monster and change the scenario. Garou wakes up from his defeat against Saitama, with no memory of what happened. Garou meets up with Tareo and sees Watchdog Man and Metal Bat, and plans to find them. Saitama signs up for the fighting tournament, and looks over a list of the contestants when Sour Face, a former disciple of Bang, shows up. Sour Face plans to win the tournament to be famous like Bang, and reveals that the year before a contestant named Wolfman won the tournament. However, authorities found the real Wolfman tied up, and added a new rule against any participants wearing disguises, enforced with a lifetime ban, as well as a heavy fee. It is also revealed that 6 months ago Garou rampaged through the dojo, disabling many of the students, including Sour Face. Garou then received a beating from Bang and was expelled from the dojo, which also caused Sour Face to quit. When Sour Face insults "Charanko", Saitama points out that at least Charanko was brave enough to fight against Garou one on one while Sour Face quit, and vows to win the tournament which angers Sour Face. Meanwhile, the Hero Association plans to protect its officials from monster attacks by assigning S Class Heroes. King manages to get away by lying that he's fighting against a secret boss when in reality he is playing a video game. Metal Bat is forced to babysit Narinki, a VIP sponsor of the Hero Association, and his son Waganma at a Mouse Sushi restaurant in S-City instead of watching his little sister play piano. When Metal Bat receives a call from his sister, two monsters named Junior Centipede and Venus Mantrap attack Nanrinki but Metal Bat easily kills them. Suddenly, another monster named Senior Centipede attacks Metal Bat. A monster named Raffleseidon appears and puts on sleeping gases which knocks out Narinki and Waganma. Metal Bat is forced to endure many hits before hitting himself in the head, which pumps adrenaline into his system, rendering the gas useless and enabling him to kill the two Demon Level monsters with one hit apiece. Two local heroes take Narinki and Waganma when a Dragon-level monster named Elder Centipede attacks Metal Bat. During the fight, Elder Centipede knocks Metal Bat near Garou. Thinking that Metal Bat is dead, Garou plans to find Watchdog Man when Metal Bat gets back up. Garou naturally wants to fight Metal Bat, but Metal Bat wants to go back after Elder Centipede. Garou initiates the fight by attacking Metal Bat, and Metal Bat barely manages to block the preemptive blow. In the post-credit scene, a martial artist named Suiryu asks two girls to lead him to the Fight tournament.

Metal Knight tries to defeat Elder Centipede, but fails to even scratch the behemoth monster. After a lengthy battle Garou defeats Metal Bat, but grudgingly admits that Metal Bat would have won if he managed to hit him even once. Metal Bat gets up and nearly kills Garou when Garou's back is turned, but stops when his younger sister, Zenko, finds him. Garou counterattacks, but Zenko gets between them and orders them to stop fighting. Garou relents (having a soft spot for kids) and walks away to find Watchdog Man. Metal Bat tries again to go after Elder Centipede, but collapses due to too much damage from his battles with Elder Centipede and Garou after Zenko slaps him back down to get him to stop. The two C Class heroes (Pineapple and Mohican) who have Narinki and Waganma are confronted by Rhino Wrestler and are swiftly defeated, which causes the monsters to capture Waganma. Two monsters named Phoenix Man and Sludge Jellyfish try to persuade Garou to join the Monster Association, but Garou refuses. Phoenix Man promises Garou that they will meet again if Garou will continue to hunt for heroes, and tells Elder Centipede and the rest of the monsters to retreat, with Metal Knight following them. Bang and Bomb continue to try to find Garou, and Bang lets out his frustration on a Demon-level monster named Boxing Demon, killing him violently with a ruthless barrage of blows. Many monsters of different disaster levels (Marshall Gorilla, Do-S, Hundred Eyes Octopus, Pure-Blood, and Make Plasma) start attacking heroes, which worries the Hero Association. Before Do-S can kill Dynamite Man (her power being that if she whips someone, they will be under her control) with her mind controlled heroes, Fubuki stops her attack. Meanwhile, in the Fight Tournament Saitama is introduced to Bakuzan, Suiryu, Lightning Max, Ring Ring, Hamukichi, Choze, Zakkos and Snek, with Genos watching in the crowd. Suiryu notices Bakuzan's bloodlust toward him, and is only after the prize money, although Suiryu wishes he could have fought against WolfMan (Garou in disguise). After Lightning Max defeats Ring Ring, Zakkos reveals that the fighters are often paired up based on their looks. Saitama deduces that Zakkos is weak since he's paired up with Saitama (Saitama being sorted due to him appearing "weak.") which angers Zakkos. In the post-credit scene, Saitama slaps Zakkos, defeating him in one hit, much to Saitama's annoyance. Suiryu notices Saitama's strength and is excited to face him in the finals.

Lightning Max loses his fight with Suiryu, and Genos gets a message concerning a lot of monsters around the tournament. Snakebite Snek beats his opponent Benpatsu, and the announcers get messages of a lot of monsters and plan on evacuating the audience, but Bakuzan convinces them not to. Sourface beats his opponent Jakuman, but they part on good terms. Sourface excitedly tells "Charanko"/Saitama that he won, but Saitama had gone to the bathroom. When Saitama faces off against Bakuzan, Bakuzan sadistically describes how he will destroy Saitama, but when Bakuzan touches Saitama's wig and states that he would knock Saitama's "hair" off, Saitama comically punches him out of the tournament in one hit, impressing Suiryu. Genos manages to kill all but one of the monsters-the last one, the Demon-level Awakened Cockroach, barely escaping. With Genos' back turned, he is suddenly attacked by a Mysterious Being. Some of the Hero Association members find Pineapple and Mohican, and they learn that Waganma was captured, but not Narinki. Meanwhile, Do-S successfully manages to brainwash all of Fubuki's henchmen, but Fubuki repels them back. Do-S says she's attacking Fubuki so that she can face Tatsumaki, but Fubuki tells her that when she's hurt, Tatsumaki will know. Right on cue, a monster lands in front of Do-S with Tatsumaki arriving. Do-S orders Fubuki's mind-controlled henchmen to attack Tatsumaki while she flees, but Tatsumaki easily knocks the henchmen into buildings. Tatsumaki gives a lecture to Fubuki that surrounding yourself with henchmen will cause you to become weak before flying away. Suiryu and Sneck face off, with Suiryu casually avoiding Sneck's strikes and questioning his reasons for fighting. He taunts Sneck by telling him that he is ineffectual as a hero, and that he sought power with no particular agenda, with his nonchalant attitude enraging Sneck. However, Suiryu knocks him out with a single blow, musing that no matter what happens, the truly strong will always survive. In the post-credit scene, Garou sees Watchdog Man, Saitama is in the bathroom, and a Dragon-level monster named Gouketsu is revealed to be the one who defeated Genos. Amai Mask's concert is attacked by monsters, a group of monsters are attacking a hospital where Mumen Rider and Tank Top Master are at, a monster named Nyan looks for Puri Puri Prisoner, but the prisoners reveal that Puri Puri Prisoner escaped prison to fight against the monsters, and two monsters named Gyoro Gyoro and Orochi have captured Metal Knight.

Child Emperor (S Class Hero Rank 5) uses his robot Underdog Man No. 22 to analyze a monster named Eyesight's poisons to find a cure for the paralysis. Child Emperor then proceeds to detonate Underdog Man when it's near Eyesight, but that did not successfully kill her as she hardened her skin. Eyesight then manages to find Child Emperor, but is interrupted and eaten by Pig God (S Class Hero Rank 10). Pig God decides to go after the other monsters in Y-City afterwards. Garou tries to go after Watchdog Man (S Class Hero Rank 12), but a monster beats him to it. Drive Knight (S Class Hero Rank 9) interrogates a monster he spared after killing the others. Death Gatling (Class A Hero Rank 8) gathers other heroes to fight Hundred Eyes Octopus, but Flashy Flash (S Class Hero Rank 13) arrives and grievously wounds it with his incredible speed. Right when Flashy Flash is about to unleash his final move, Tatsumaki (S Class Hero Rank 2) arrives and kills Hundred Eyes Octopus with ease, berating Flashy Flash for being too slow before leaving, but not before Flash insults her back. Amai Mask kills monsters in his concert and Mumen Rider and Tank Top Master defeat monsters in the hospital. Atomic Samurai attends a meeting with the Council of Swordsmasters (Nichirin, Amahare, Zanbai, and Haragiri) to discuss the Garou problem. Haragiri reveals that he has sided with the Monster Association, and gives the sword masters 3 monster cells which will amplify their strength, speed and skill at the cost of their humanity and turning them into monsters. Haragiri tries to kill Atomic Samurai (as Atomic Samurai is too much of a threat). but Atomic Samurai slays Haragiri before leaving with his disciples (Bushidrill, Iaian and Okamaitachi) to find the Monster Association base. Meanwhile in the Super Fight Tournament, Saitama defeats Sourface and Choze before facing off against Suiryu in the finals, with Suiryu promising to show Saitama what martial arts are all about. During the fight Suiryu begins to express his disdain about the hero lifestyle, and tries to persuade Saitama not to become a hero since it is pointless and boring to do heroic justice and save the day. Instead, Suiryu remarks that people with great strength such as Saitama should seek thrills, just like him before he kicks Saitama in the head. Angered and annoyed, Saitama lets the kick connect, knocking the wig off his head. Finally exposed, Saitama throws a short range punch while exclaiming that if Suiryu's goal is to seek fun, he shouldn't try to make himself stronger than he is currently. However, Saitama restrains his punch before it hits Suiryu, which creates a powerful shock wave that blows off Suiryu's clothes, exposing his muscular body and leaving him in a state of deep shock. Despite Saitama being disqualified, Suiryu still attacks Saitama in anger, even using his final attack (Void Phoenix Ascension Fist). Saitama is unfazed by the assault. When Saitama says that martial arts are techniques that make you look cool, and starts spinning around, Suiryu tries to attack Saitama yet again but is knocked back by Saitama into a wall while taking Saitama's white belt, resulting in Saitama's pants falling down. Despite Suiryu embarrassing Saitama with that action, he is still in deep shock that he lost. In the post-credit scene, Genos wakes up from the wreckage, and a monster is heading toward the Martial Arts Tournament.

Suiryu is handed his trophy (due to Saitama being disqualified), when suddenly the monster Gouketsu (the one who attacked Genos) and his monsters arrive, knocking out Lightning Max and Snek. It is revealed that Gouketsu was a former human who was a martial arts champion when he was kidnapped by Orochi and Gyoro a few years ago. They offered him a monster cell in exchange for his freedom, and when Gouketsu ate the monster cell he became drunk on power and became a full monster. Gouketsu gives the monster cells to some of the martial artists, where Choze and others became monsters. Suiryu defeats Choze and the monsters, and openly defies Gouketsu by throwing the monster cell back at him. Gouketsu orders his monster crows to beat the remaining martial artists (Sourface included) and pummels Suiryu. Bakuzan watches the chaos unfolding, and reveals that he hated Suiryu, but admits that Suiryu will always defeat him. Bakuzan gathers 3 monster cells to prevent Suiryu from being tempted, and eats all three of them. However, the strain is too much and Bakuzan faints. Before the monster crows (Gouketsu's dolomites who lost their humanity when they ate the monster cells) can eat Suiryu, Lightning Max and Snek save Suriyu and the three beat the monster crows. Lightning Max and Snek plan to stall Gouketsu so Suiryu can get help, but Bakuzan in his full monster form arrives and pummels Suiryu half to death. Meanwhile, Mumen Rider and Tank Top Master are defending the hospital that Charanko is in. Bakuzan arrogantly proclaims that he is the strongest after defeating Suiryu, but Gouketsu warns him by nearly killing him with a punch (that destroys a part of the colosseum) that there are other monsters that are stronger. Gouketsu gets a message from Gyoro to retreat as S Class Heroes are coming, and Gouketsu warns Bakuzan to not get too arrogant. Suiryu weakly tells Bakuzan that he won, and to spare him but Bakuzan reveals that he enjoys inflicting pain on weak individuals, and is about to step on Lightning Max and Snek. Suiryu finally pleads for other heroes to arrive to help, and Saitama arrives in the nick of time to save Lightning Max and Snek from being stomped on before facing off with Bakuzan.

Bakuzan recognizes Saitama as the one who defeated him, but Saitama kills Bakuzan in one punch. Saitama formally introduces himself to Suiryu as a hero and explains that he joined the martial arts tournament to find the hero hunter (Garou) as well as experience martial arts. Saitama plans to leave but Suiryu begs Saitama to not to because Gouketsu is out there, but Saitama ignores him. Suiryu hears multiple blows and crashes, and thinks Saitama is killed when Gouketsu's severed head lands in front of him. Saitama returns and asks Suiryu to not tell anyone what happened, and Suiryu asks if he could become a hero. Saitama agrees, since a nobody like himself can become a hero but when Suriyu asks to be Saitama's disciple, Saitama declines. Puri Puri Prisoner manages to defeat a demon-level monster called Free Hugger by hugging it so tightly that it explodes. Puri Puri Prisoner receives a call that his cell mates were captured by monsters. While walking after talking to C Class Water Gun, Saitama has an existential crisis by reflecting that his experience with martial arts and in the Hero Association has still left him bored. King meets up with Saitama and tries to explain that Saitama was so focused on being the strongest hero, he lost track of himself and should aim to be the best hero. Saitama declines, saying that it sounds boring but just when he gives up hope King offers to play against Saitama using only two fingers, rekindling Saitama's drive. Garou is defeated by Watchdog Man due to the unpredictable fighting style of Watchdog Man (his fighting style is more based on that of a wild beast, which Garou has no counter for) but is filled with adrenaline on what he can learn. Garou sees King, and is about to hit him when Saitama kicks Garou into a concrete wall. Saitama mentions that there are news of a hero hunter, and can't wait to meet him. Genos is taken in for repairs to Dr. Kuseno, and Sonic is training when he is attacked by two very powerful ninja warriors named Gale Wind and Hellfire Flame, who offer Sonic monster cells to become stronger. Sonic plans to eat the monster cells, but due to him cooking the monster cells he doesn't undergo transformation and has diarrhea instead. S Class Hero Rank 8 Zombieman sees Martial Gorilla, and is about to follow him when Armored Gorilla encounters Martial Gorilla. Armored Gorilla knocks Martial Gorilla unconscious, and Zombieman decides to follow Armored Gorilla instead. Bang and Bomb talk about Garou, and a monster infiltrates a member of the Hero Association to give them a message.

Saitama loses to King multiple times in a video game. While taking a break, Saitama notices King's phone, in which King explains the phone is used to call for hero emergencies. Gyoro-Gyoro and Destrochloridum take control of an executive in the Hero Association, in which they negotiate for a future where monsters and humans coexist. Destrochloridum then kills an executive, revealing that they were lying and instead outlines their true plan to the Hero Association: for the heroes to assemble and face the entire Monster Association in an all out battle, before the vessel that Gyoro-Gyoro controls explodes. Destrochloridum grabs his pistols to attack the remaining executives but Superalloy Darkshine (S Class Rank 11) arrives and kills Destrochloridum after it fails to take control of him. Gyoro and Monster King Orochi hold a meeting for monsters to fight against the heroes, when Orochi notices Awakened Cockroach and eats him due to Awakened Cockroach losing to Genos earlier. Do-S is spared from Orochi when Gyoro Gyoro notes she has special abilities. Orochi asks Gyoro Gyoro where Gouketsu is, but Gyoro Gyoro finds out that Gouketsu was killed. Leaks that the Monster Association are going to war with the Hero Association reach the public and the monsters (who reside in the city) plan to go kill humans and join the association, but they are all slain by Saitama, who is late for garbage duty. Garou wakes up from Saitama's kick, and sees A Class Hero Death Gatling, but is too tired and goes to a shack to rest, with Death Gatling noticing him. Tareo and his friends find someone in their shack and force Tareo to get that person out. Garou and Tareo meet again, and Garou tells Tareo if he doesn't want anyone to bully him, he should get stronger. Genos gets upgrades from Dr. Kuseno to better handle villains. Death Gatling arrives with his crew (Stinger, Smile Man, Wildhorn, Chain Toad, Glasses, Gun Gun, and Shooter) to confront Garou. Garou notices the crew, and looks at Tareo's almanac briefly before facing off against the heroes. Loudly proclaiming that after defeating them, he will have beat 100 heroes, Garou lunges at the heroes but is knocked back and kept unsteady by the barrage of attacks, taking two poisoned arrows to the back. Noting their teamwork, Garou targets Glasses, the presumed weak link, only to learn that Glasses is ready and able to fight as well. The heroes give the weakening Garou one last chance to surrender.

Death Gatling explains their reasoning to take down Garou: to earn respect from the Hero Association, who only cares about S Class and ignores the rest of the hardworking heroes, despite the amount of effort the lower heroes put in their work. Garou takes down Chain Toad, Shooter, Gun Gun, and Wildhorn. Death Gatling starts shooting at Garou, but Garou gets close to Glasses. Glasses remembers how he was looked down upon in Fubuki's group, when he was saved by Saitama in the past. Saitama tells Glasses instead of looking at his failures, he should move forward instead. Garou quickly defeats Glasses and Stinger, leaving Death Gatling the only one still standing. Garou tries telling Death Gatling that there's a kid in the shed, however Death Gatling doesn't believe Garou and uses his final move: Death Shower. Garou singlehandedly redirects all the bullets elsewhere, saving Tareo. Garou defeats Death Gatling after insulting his pride, and Tareo runs away after seeing the defeated heroes. Garou tries to find a place with water, but Genos arrives thanks to Glass' signal. King barely beats Saitama in a video game match, making Saitama stressed out. King's phone vibrates, and says that Genos is at the place where the signal is located. Remembering that Genos always gets destroyed, Saitama and King start to go the location. Garou and Genos start fighting, with Genos pinning Garou to a tree with his robot hand. Genos nearly kills Garou, but Garou manages to escape and proclaims himself as the monster that no one can defeat. Genos counters that statement, saying that Saitama will always defeat any monsters because he's strong, leading Garou to ask who Saitama is. Suddenly, a group of monsters ambush Genos, but Genos swiftly kills them all, stating that he learns from his mistakes and will be stronger. Genos is about to fire at Garou once more but Bang kicks Garou in the head. Bomb arrives with Bang and kills more monsters, requesting Genos to leave Garou to Bang. As Bang and Garou get in their stances to fight, Bang remembers his first time meeting Garou.

Silverfang Fang and Bomb start to beat up Garou mercilessly. Garou remembers when he was a young loner and had a popular classmate name Tat-Chan. It is revealed that the reason why Garou hates heroes and wants to be a villain is because he believes that people only want to be a hero to beat up weaklings, as shown when Tat-Chan gangs up on Garou simply because he's a "monster." Garou repels Fang and Bomb, and Phoenix Man arrives and saves Garou. Genos is about to kill Garou and Phoenix Man but Phoenix Man calls for Elder Centipede to help. Fang and Bomb briefly wound Elder Centipede, but Elder Centipede knocks them back and sheds his damaged armor. Genos plans to stall Elder Centipede to give a chance for Fang and Bomb to get the defeated A Class Heroes to safety. Genos briefly wounds Elder Centipede, but Elder Centipede quickly regenerates and knocks Genos back. Genos starts to become disillusioned, believing himself as worthless since he could not beat the behemoth Dragon-level monster. Fang plans to take on Elder Centipede himself when King arrives with a megaphone challenging Elder Centipede. The Hero Association briefly gave King history on Elder Centipede, and King lies that Blast (S Class Hero Rank 1) has arrived, goading Elder Centipede to fight him. Before Elder Centipede could kill King, Saitama arrives and kills it with a Serious Punch. Saitama and Genos see each other in the wreckage, and Genos asks Saitama what he lacks. Saitama simply replies, "Power," which Genos takes note on, to the despair of King. Genos then looks forward to the future, believing he will be stronger now. The episode ends with Saitama asking the remaining heroes if they want to go back to his apartment.

In the post credit scene, Garou finally passes out from exhaustion and Phoenix Man plans to take him to Orochi.

A second season commemorative special that serves as a recap of the first season.