Five years into an arranged marriage, Rin, a dissatisfied housewife, endures a dull, sexless relationship. Every day, she indulges in masturbation while fantasizing about her dashing neighbor, Mr. Matsudaira. One day, when Sakurai, the handsome owner of a house cleaning service, comes by to deliver a community notice, Rin vents her frustrations about her husband. Provoked by his words, she can no longer suppress her overwhelming arousal. Unable to resist, she forcefully pushes him down... In an instant, a relationship bordering on adultery begins. From the cracks in everyday life, desire surges forth, leading to a new turn of events.