While her husband's business trip drags on, I-cup big-titted wife Sumire struggles to suppress her constantly aroused body. One day, she receives a sudden call from her senior in college and invites him over to her home. In this unexpected encounter, Sumire succumbs to overwhelming desire, indulging in a lewd affair. Witnessing part of this scene, a nearby noodle shop owner becomes consumed by lustful fantasies and sneaks into Sumire's house. Behind the husband's absence, intense passion and craving for infidelity swirl between the two.