Backwasher! Her and I, in the Women's Bath!?

Souta takes a part-time job as a back washer at a sentou in his hometown. He soon finds himself washing Aoi, a classmate who is trying to conceal her true identity. Despite enduring her harassment, Souta continues his work, unaware of her feelings. As he massages her, he begins to understand that Aoi has developed a one-sided love for him. The intimate setting of the sentou, with its hot water and close proximity, intensifies their interactions. Aoi, in turn, realizes the back washer is Souta. This revelation sets the stage for a love comedy filled with awkwardness and the blossoming of feelings between the two, all unfolding behind the privacy of the red curtain.