Tsumugi is a married part-time worker at a beef-bowl restaurant, helping support the household because her husband earns little. After drinks with a younger adult student coworker following closing time, she lets herself go and begins an affair. The attention brings excitement back to her dry routine, and she sinks into escapist sex. She tells him they can skip the condom, and the consenting age-gap lovers have raw sex and creampies during every stolen moment, both during and after work.