The Neighbor No. Thirteen - Region 1 DVD

Lead by the sadistic Akai, young Juzo suffered from all kinds of abuses from his classmates. Years later, Juzo is hired at a company where Akai is employed, lives in an apartment right below his and the abuses are repeated once again. Number 13, Juzo's terrifying alter ego, soon appears to put an end to the culprits and everyone else that crosses his path.