Maki Usami, 33 years old. A full-time housewife raising her 4-year-old son. With her child always around, there's no time or chance for sex, and her husband has even told her he "can't get in the mood." After giving birth, their sexual frequency dropped sharply, while her masturbation habits increased. Recently, she's been satisfying her volcanic desires at least twice a day—watching porn on her smartphone in between housework and childcare. But as this routine continues, she finds herself increasingly detached even during their rare sexual encounters, realizing that her husband's weak erection and feeble thrusting can't compare to the intense scenes she watches daily. Then comes a chance: leaving her child at her parents' home, finally giving herself some long-overdue personal time. An erotic chapter begins—years of pent-up frustration about to be unleashed all at once.