Atsushi is living with his older brother and Kasumi while looking for a new job. When a neighborhood man accuses him of making a move on his girlfriend, Atsushi asks Kasumi for help, and she goes to confront the man herself. But he threatens to ruin her brother-in-law's future unless she submits to his sexual demands. Unaware that the whole incident was a setup, Kasumi sacrifices herself to protect Atsushi. After using her, the man tells Atsushi every humiliating detail. Learning what his sister-in-law endured for him fills Atsushi with jealousy and lust, which he turns on Kasumi herself.