The Neighbor No. Thirteen

Jûzô Murasaki is a boy miscast in his classroom, being frequently abused, tortured, beaten and humiliated by the bully Tôru Akai and his gang of juvenile punks. After years of repression, rejection and fear without facing Akai, he develops a psychopathic dual personality with a violent alter-ego. While living in the apartment 13 of a tenement building, he becomes unable to control his violent dark personality, who plots an evil revenge against his upper floor neighbor Akai and his family.

The Neighbor No. Thirteen is a 2006 horror thriller movie directed by Yasuo Inoue, starring Shun Oguri, Hirofumi Arai, Shidô Nakamura. It holds an IMDb rating of 6.3/10 from 1,351 votes and runs 1h 55m.