Tatsumi, a corpse cleaner for the yakuza, discovers that Aoi, the younger sister of his ex-girlfriend Kiyoko, has stolen drugs from the yakuza. At Kiyoko's request, Tatsumi hides Aoi's theft. However, the yakuza believe Kiyoko's husband is the thief and kill him. Tatsumi and Aoi accidentally witness the murder and manage to save Kiyoko, but she eventually dies. Stricken by the death of Kiyoko, who was a special person to both of them, Aoi resolves to seek revenge, and Tatsumi stays by her side.