SDMUA-013: Mr. Kuruki in room 303 and Mr. Narisawa's wife in room 320 don't know the rules of this apartment, so why don't you do as much as you × like?

Rei, who has been living with her husband and wife, moves to her longed-for Tawaman. I had high hopes for a new life in a luxury hotel-like apartment, but there were special 'rules' made by the mothers of the old residents. Rei happened to meet Kisaki, who was an old classmate, and became close to her. However, the rules broke the two of them. The last laugh is...