月刊少年マガジン
Oshimi debuted with "Superfly" in Kodansha's Monthly Shōnen Magazine. He would go on to start his first series "Avant-Garde Yumeko" in the magazine. His works have been adapted into many different media, with "Drifting Net Café" and "Inside Mari" into television dramas, "The Flowers of Evil" into an anime, and "Sweet Poolside" into a live action film. In 2001, he won the Tetsuya Chiba Award.