The three sisters, bored with their stale relationships, come up with a bold plan to swap boyfriends. Eldest sister Chisato lets a mother complex man suckle her big tits to his heart's content. Middle sister Reika indulges in relentless sex with a famously high-stamina man, experiencing pleasure like never before. Youngest sister Nanako is tormented by a shy yet persistent guy, climaxing repeatedly with powerful squirts. Each discovers thrilling sex they could never have with their regular boyfriends. Though equally horny, each sister has her own unique charm. They capture a perverted landlord and gang up on him with aggressive female domination. The film culminates in a rare triple blowjob scene, driving him to agonizing ecstasy before he finally cums.