A married woman who received a duplicate key lived alone in a room where a male student was creampied until he graduated. Yuki Yoshizawa
One day, Kenji, who lives alone, meets a married woman, Tomoki, at a nearby pub. He ends up having a drink with his girlfriend who is at a loss after having a rift with her husband, but... After that, he became friends with her, and before he knew it, they began to have a physical relationship. Kenji gave Yuki a duplicate key to his home, and Yuki started heading to Yuki's house with a shopping bag in hand when her husband went to work. Then, as if to relieve the loneliness of being a married couple, she begins to spend a lot of time in his younger boyfriend's room...
