Kanan, a plain and serious housewife, starts working part-time at a convenience store without her husband's knowledge, but begins to fall in Kokoro with a university student she meets there, Hayashi. Kanan invites Hayashi to a bar after work, where she confesses her dissatisfaction with her life, and as she gets drunk, they have sex. From then on, she transforms into a lewd woman who does standing doggy style in the convenience store whenever she gets the chance, trying to suppress her voice...