The FANZA doujin hit from diletta and Yasuto Kimura, with more than 50,000 copies sold, gets a live-action adaptation. Shuhei lives beside single mother Kyoko and her son Taisei in an old apartment. After helping Taisei out of trouble, he grows close to Kyoko and is invited over for dinner. A chance discovery of her masturbation habits gives him an obvious erection—and instead of backing away, Kyoko reaches over and starts stroking his cock. They fondle each other while her son is absorbed in anime, but restraint soon disappears. From then on, the neighbors fuck day after day in that cramped four-and-a-half-tatami room until both are drenched in sweat.