Ryūki Kajita (梶田 隆基, Kajita Ryūki, born October 14, 1987),^[1][2] known professionally as Mafia Kajita (マフィア 梶田), is a Japanese writer, radio personality, actor, and voice actor. Kajita is a writer and radio personality for the Japanese gaming news website 4gamer.

While attending a boarding high school, Kajita spent time reading gaming magazines and noticed a job opening for a game writer. After being transferred to a different high school, Kajita spent time on video games, anime, and manga, and attended a vocational school after graduating. He was accepted into Vantan [ja] as a writer for the games department, where he was later introduced to Tomokazu Sugita by a senior writer.^[3]