Rinjin 13 Gou

The following content is intended for mature audiences and may contain sexual themes, gore, violence and/or strong language. Discretion is advised.

In grade school Juuzou was tortured by his classmates and develops an alter ego. Years later, Juuzou has to work with one of his bullies named Akai, who move into the apartment above his. As time progress Juuzou's revenge minded alter ego takes over and becomes a psychopathic killer.
Made into Live action movie in 2005.