Seishu Hase

Mixed up by desire, love and hatred, a disturbed young man begins tailing and eventually tries to save his neighbor, a housewife who has turned to prostitution despite her comfortable lifestyle.

Kenichi is a half-Japanese, half-Chinese man of the underworld. You can sell him anything except children's organs. His domain is in Kabukicho, a gangland controlled by various Shanghai gangs intent on taking control. His former partner-in-crime, Fu-Chun, is rumored to have returned to Kabukicho, having fled years earlier after killing the number two of gangland boss, Yuan. Yuan wants to get even and attempts to do so by using Kenichi.