As a grocery store salesperson, Yoko-san's busy daily work has already put her under a lot of pressure, and it made her even more bored and depressed when she learned that her husband was cheating on her with another woman. With her patient and enduring personality, she quietly kept this matter secret because she didn't want to ruin her current marriage; only when she got drunk one night with a part-time student co-worker did she reveal her feelings, which made him sympathetic and compassionate. That night, they both went to his house, and he bravely expressed his feelings, saying he had liked her in silence for a long time. Due to her unstable emotions, she agreed to have sex with him but on the condition that it would be just once and no one should know. It seemed like everything would stop there, but in fact, it was just a prelude to further secret encounters between these two sex-obsessed individuals.