is a Japanese manga artist. He is also known by the name Joker Jun. In 1991 he replied to a recruitment ad for Toaplan. Along with some other staff Inoue was transferred to Gazelle before he left to join Cave, where he worked as character and graphic designer, sound producer, and a video game director. ESP Ra.De. was his first title as graphic director. He debuted as a manga artist in 2002, with his work . He is best known in the West for his manga Btooom!, which was serialized from 2009 to 2018.