A married woman who received a duplicate key was then creampied in a room where a male student was left alone.

One day, Yuki lives alone, and meets a married woman, Nao, at a nearby izakaya. I ended up drinking with my husband and my girlfriend, who was at a loss as I shared a table... This led me to become friends with her and eventually started to develop physical relationships. Yuki gives Nao the key to her home, and when Nao is in work, she begins to head to Yuki's house with a shopping bag in her hand. Then, as if to relieve the loneliness of passing the couple, they began to spend a lot of time in his younger room...