Saki inherited her parents' house and lives with no children. She lives happily and modestly supporting her husband, who is a businessman. One summer day, while she is doing housework, a stranger suddenly breaks into the house to rob her. Saki is terrified, but realizes that the man is her husband's younger brother, Kyosuke. He's in debt to a loan shark and has been fired from his job... In his desperation, the brother-in-law rapes Saki by force. And he ends up staying in the house... The scum brother-in-law who ran away to his parents' house is a sex-crazed monster! He continues to rape his brother's wife, not caring that her husband has found out!