SAN-099 A long-haired black-haired big-breasted housewife, Rina Takase, craves the body of a man whose name she doesn’t even know.

Rina’s father-in-law likes women and puts his hands on his girlfriend’s wife, but when he finds out, the man gets in on her and beats her up. “Rina” offers her body to help his father-in-law. Eventually, a change occurs in her mind and she gradually becomes obsessed with sex. What will happen to her when her husband returns from his business trip?