Alternative Titles: Araiya-san! Ore to Aitsu ga Onnayu de!?, 洗い屋さん! ~俺とアイツが女湯で!?~, 목욕관리사씨! ~나와 그 녀석이 여탕에서!?~, 洗屋先生, 洗屋先生！～我和那家伙在女浴池！？, Backwasher, Backwasher! -Her and I, in the Women`s Bath!?-, Ella y yo en el baño de mujeres, Mister Washer!: She and I in the Female Bath!?, Washer! She and I in the Women`s Bath!?, Банщик: Я и она в женской бане?!
Tsukishima Souta begins working at his family's public bathhouse as a back washer. While concealing her true identity, Souta's classmate Yuzuki Aoi visits the bathhouse. A relationship between the two begins to develop when Souta washes Aoi's back.
