At a spa run by his wife's friend, a man meets Ayase Maina, a stunning temptress who uses her G-cup breasts and thick, curvy ass to capture any target. Each visit brings more body-to-body teasing through a thin layer of cloth until he is obsessed with her. They finally cross the line, and guilt over betraying his wife only heightens the thrill as he loses himself in forbidden sex and creampies her.