A couple, Tatsuya Iwase and Kaori Iwase lived in a certain apartment. One day, the Kayabe couple moved into the next room. The two are relieved that it they seemed to be a good couple. But.... They can hear the moans from the other apartment night ... They didn't notice it until now because it had been vacant, but the walls of the apartment were unexpectedly thin. The couple are bothered by the lustrous voices that they hear. In order to put an end to the frustrating days, they decided to talk to the couple next door. The noise problem that seemed to be solved after that, but then they heard that voice in the daytime ...