Katte ni Kaizō

Katte ni Kaizō
Cover of the first manga volume
かってに改蔵
Genre	Black comedy
Manga
Written by	Kōji Kumeta
Published by	Shogakukan
Demographic	Shōnen
Magazine	Weekly Shōnen Sunday
Original run	1998 – 2004
Volumes	26
Original video animation
Directed by	Akiyuki Shinbo
Studio	Shaft
Released	May 23, 2011 – Oct 26, 2011
Runtime	approx. 23 minutes
Episodes	6

Katte ni Kaizō (かってに改蔵^?) is a shōnen manga by Kōji Kumeta. The manga ran for 26 volumes in Shōnen Sunday from 1998 to 2004. The art style underwent significant changes as the series progressed, the art resembling that of Kumeta's next series, Sayonara Zetsubō Sensei by the time of its conclusion. An anime adaptation by Shaft was released from May to October 2011.

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 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.