Her husband won't take care of her... Yuu is complaining about this to a female friend at an izakaya when she meets Yuzuru, a student who was drinking at the seat next to her. Due to her being drunk, the distance between the two becomes closer, and Yuu ends up having a relationship with Yuzuru's girlfriend. Yuu receives a duplicate key to her room from his girlfriend, Yuzuru, and uses her duplicate key to enjoy the time he spends waiting for Yuzuru to come home. And go home