Jûzô Murasaki is a kid miscast in his class, being often abused, hurt, ruined and also embarrassed by the bully Tôru Akai and also his gang of juvenile punks. After years of repression, being rejected and worry without encountering Akai, he creates a demented dual personality with a terrible alter-ego. While staying in the home 13 of a tenement building, he ends up being unable to control his violent dark individuality, that stories a wicked retribution against his top floor neighbor Akai and also his family members.