SDMUA-013 Kuruki-san in room 303 and Narusawa-san's wife in room 320 don't know the rules of this apartment, so why don't we rap them as much as we want?

Rei, who has been living happily with her husband, moves to Tawaman, a place she admires. I have high hopes for a new life in an apartment that looks like a luxury hotel, but there are special 'rules' made by the mothers of the old residents. Rei happened to reunite with an old classmate, Kisaki, and became close friends. However, the two were broken by that rule. The last laugh...