Teen soccer player, Hayasaki Ryoushirou, moves back home because of a sports injury. When his four older sisters find loli magazines in his luggage, the only possibly therapy for his unacceptable behavior is sex with some real grown-ass women. Like his sisters.
Dude stumbles upon a cursed jar that dooms him for eternity unless he impregnates some bitches. And it just so happens, he has three step-sisters willing to help.