Taking a part-time job at a public bathhouse in his hometown, Souta had no idea that everything would flow out into soaping the back of a former classmate, Aoi. But why is Aoi trying to hide her identity? And how did Souta figure out that the girl was head over heels in love with him? How does an innocent massage behind red bath curtains turn out when both the washer and the client are desperately clumsy? Yes, that's the half-heartedness that's now on every season of late-night airplay.