Kaizō is written and illustrated by Kōji Kumeta. It was serialized in Shogakukan's Weekly Shōnen Sunday from May 6, 1998, to August 4, 2004. Shogakukan collected its chapters in twenty-six tankōbon volumes, released from January 18, 1999, to September 17, 2004. In 2010, Shogakukan started re-releasing the manga in a 14-volume shinsōban edition, to celebrate Kumeta's 20th anniversary as a manga creator. The volumes were published from April 16, 2010, to June 17, 2011. Volume list Original video animation In January 2011, an original video animation (OVA) adaptation of the series was announced. Three volumes, each one including two episodes, were released from May 25 to October 26, 2011. The series was directed by Naoyuki Tatsuwa under the chief direction of Akiyuki Shinbo at Shaft. The series was written by Katsuhiko Takayama and Shaft, features character designs from Hiroki Yamamura (at the time from Studio Pastoral), and has music by Ruka Kawada. The episodes are split into segments, and some episode's segments were outsourced to other studios: episode 2 and 6's B-parts were outsourced to Studio Pastoral, and episode 5's A and B-parts were outsourced to Asahi Production. Yamamura also served as chief animation director across the series, and Yuka Kudou also acted as chief animation director for episode 5's A and B parts. Episode list Notes References External links Anime official website 1998 manga 2011 anime OVAs Comedy anime and manga Kōji Kumeta Shaft (company) Shogakukan manga Shōnen manga