Katteni Kaizō
Plot. The series follows the strange goings-on that surround Kaizō Katsu, an eccentric student who has a unique perspective on the world around him. He was once a child prodigy but at the age of 7, his childhood friend Umi Natori kicked him off the jungle gym and he suffered a head trauma, changing his personality. He gained a huge interest in various weird things such as UFOs and ghosts. At 17, Kaizō was hit by a human anatomy model that accidentally dropped from the second floor of the school building. Being revived with a defibrillator, he  starts to believe he was rebuilt as a cyborg by the president of the science club, Suzu Saien, who facilitates that belief for her own entertainment. Kaizō joins the science club and becomes a constant annoyance to Umi and also the bane of the existence of another member of the club, Chitan Tsubouchi. At the time of his accident at the age of 7, Kaizō was also attending the Genius Cram School, a local institute for prodigies in various fields like sleeping or fashion. However, after the accident a dazed Kaizō destroyed the building by inadvertently mixing dangerous chemicals. Now  the science club constantly runs into people that also used to attend that same cram school and display even more eccentric behavior than Kaizō himself. Media. Manga. "Katteni 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. Original video animation. In January 2011, an original video animation (OVA) adaptation of the series was announced. It was directed by Akiyuki Shinbo at Shaft. Three volumes, each one including two episodes, were released from May 25 to October 26, 2011.