Mitsuno, a housewife in her 40s, is happy with her life but works part-time at a local restaurant to refresh herself. One day, a new university student, Matsumoto, joins the company. Mitsuno acts as a good senior and supports the clumsy but hardworking Mitsuno, and gradually the two develop a relationship of trust, and Matsumoto begins to fall in love with Mitsuno, despite knowing that she is a married woman. Mitsuno, who notices this young man's feelings of love, is happy to be seen as a woman as well, and accepts him. And so, even while he is working part-time, the two begin to indulge in an affair...