Inheriting her parents' house and living alone without children, Saki lives happily while modestly supporting her office worker husband. One summer day, while doing housework, a stranger suddenly breaks in and robs her. Although extremely scared, Saki recognizes that the man is Kyosuke, her husband's younger brother. Debt-ridden, fired from the company. Forced by her desperate brother-in-law. And just stay home. The scumbag brother-in-law who ran back to his parents' house is a sex-crazed monster.