Tatsuro Ikeyama (voiced by Hiroaki Hirata), is a neurology lecturer who has obsessive compulsions to do inappropriate things, such as: dump a dump truck's load waiting at traffic lights, Hang and swing on chandeliers, change the channel to watch baseball while his family watches kabuki, and to remove the toupee of his father-in-law who is also a lecturer. In the latter Irabu helps Tatsuro remove his father-in-law's toupee while he is asleep "supervising" students doing exams, as well as fart in a full elevator and pin the blame on another doctor. The cause towards his compulsions is the controlled and plain lifestyle of his family life and work. After his shot, Tatsuro appears as a multi-colloured chameleon. He can change his collour to make himself invisible, leaving only his clothes.
池山達郎は大学病院で勤務する精神科医。医学部長である野村の娘と結婚し、周囲の羨む生活を送っている…はずだったが、野村家での生活に馴染めずにいた。
次第に発症する心の病の症状を抑えようと必死になっていた達郎はある日大学の同窓会で伊良部と再会する。旧友の異変に気づく伊良部だが、達郎はなかなか伊良部に症状を打ち明けようとしない。
精神科医の心の悩みに伊良部はどうする？そして、達郎を追いつめる義父の「アレ」とは一体？
Tatsuro Ikeyama (con la voz de Hiroaki Hirata), es un profesor de neurología que tiene compulsiones obsesivas por hacer cosas inapropiadas, como: tirar la carga de un camión volquete que espera en el semáforo, colgarse y columpiarse en candelabros, cambiar de canal para ver béisbol mientras su familia mira kabuki y quitarle el peluquín a su suegro, que también es profesor.
