"Backwasher! -Her and I, in the Women's Bath!?-” centers on the life of Itsuki, a high school student who finds himself in an unusual predicament after a mix-up at a public bathhouse. Due to a series of misunderstandings, Itsuki is mistaken for a girl and ends up working part-time at a women’s bathhouse. The situation is further complicated by the presence of Yuzu, a cheerful and outgoing girl who works alongside him. Yuzu quickly becomes suspicious of Itsuki’s true identity but decides to keep his secret, leading to a series of comedic and awkward situations as Itsuki navigates his dual life.

The narrative explores the challenges Itsuki faces in maintaining his disguise while interacting with the bathhouse’s diverse clientele, including regular customers and coworkers. The story balances humor with moments of tension as Itsuki’s secret is constantly at risk of being exposed. Yuzu’s playful and mischievous nature adds to the comedic tone, as she often teases Itsuki while also helping him avoid detection. The dynamic between Itsuki and Yuzu forms the core of the series, with their interactions driving much of the plot.

As the story progresses, Itsuki’s relationships with other characters deepen, including his bond with Yuzu and his interactions with the bathhouse’s owner, who remains unaware of his true identity. The series also touches on themes of identity, trust, and the complexities of human relationships, all while maintaining a lighthearted and comedic tone. The setting of the bathhouse provides a unique backdrop for the story, allowing for a mix of situational humor and character-driven moments. Overall, the series blends comedy, slice-of-life elements, and a touch of romance, creating an engaging narrative centered around Itsuki’s unconventional experiences in the women’s bathhouse.