Included one-shot:
Volume 13: Yuuryou Bukken Chuukai Shimasu (A Brooding, Gloomy Property) Katte ni Kaizou was published in Spanish by Editorial Ivrea from June 30, 2003, to July 16, 2010.

Main
A 17-year-old Junior in high school, Kaizou has led an interesting life. A former genius, Kaizou's life changed the day his friend Umi kicked him off the jungle gym at the local playground. Ever since that day he's become an eccentric young man who believ...
Main
Umi has been friends with Kaizou for a long time and is in fact to blame for his strange behavior. Even though she feels some guilt over what happened, she cannot bring herself to admit what she did.(Source: Wikipedia)...
Main
Suzu is the head of the Science Club and the only Senior in the group. Upon meeting the eccentric Kaizou she decides to indulge his belief that she has turned him into a cyborg.(Source: Wikipedia)...
Supporting
Suzu's self-crowned nemesis. Used to be in a pop-group with Suzu until Suzu quit, leaving Jun stranded in Tokyo after moving there from Osaka. She now seeks revenge for that on Suzu....