Kazushi Hagiwara is a manga artist who began his career as the assistant of Dirty Matsumoto and Izumi Matsumoto. He debuted in Weekly Shonen Jump with a short story in 1987. He is best known as the creator of the fantasy manga 'Bastard!!!', that first appeared in Weekly Shonen Jump in 1988. It is published irregularly in Ultra Jump and is also published in English by Viz Media. His group of assistants are called Studio Loud In School and they regularly publish their doujinshi manga 'Wonderful Megadeth'.