Hana, a married woman with an voluptuous figure, comes to the house as a private tutor for Shinichi, the son. Her enormous breasts captivate everyone, especially the father, Kinya, who becomes completely obsessed with her. Sensitive to the mature scent of middle-aged men, Hana constantly seduces Kinya, driving him to repeated arousal. Experiencing his first ejaculation in over a decade, Kinya falls helplessly under Hana's spell, and the two remain locked in an inescapable, lustful relationship.