Five years after leaving the countryside for Tokyo, Nonoka—the childhood friend of an older man’s son—returns home transformed from a quiet honor student into a blonde gyaru. Wearing a thin camisole that shows her underwear, she presses close and seduces him into sweaty sex, beginning a summer of relentless ejaculation. Day two brings a risky handjob where they could be caught, day three features naked poolside oral, and day four ends with close-contact oil sex and a creampie.