The Sashiharas, Yasushi and Mariko, are newlyweds. When their marriage begins to stagnate, he suspects she’s having sex with someone else.
When Yasushi confronts Mariko and demands to know the truth, she tells him the intimate details of her affair: her other partner’s trouble climaxing, and how it means he can keep going for hours. Her multiple orgasms, which are something Yasushi can never give her. How he reached the deepest places inside her, awaking her to that new pleasure…