Inheriting her parents' home and living alone without children, Saki lived happily while modestly supporting her office worker husband. One summer day, while doing housework, a stranger suddenly breaks into a robbery. Despite being terrified, Saki realizes that the man is Kyosuke, her husband's younger brother. Debt from dark money, fired from the company... A desperate brother-in-law forces Saki. And just stay at home... The scum brother-in-law who ran away to his parents' house is a libido monster! Keep Fucking My Sister-In-Law Without Worrying About My Husband Barre!