Mio, the only daughter working at her family's hot spring inn, spends her days cleaning the bathhouse. She's constantly surrounded by neighborhood boys who come by to play and enjoy the free baths. Watching them, Mio naturally begins washing their bodies herself. Gradually, her lust begins to rise. Starting with scrubbing their bodies on chairs, she moves on to periscope blowjobs, loofah washes, and mat play—washing the boys in every way imaginable, while repeatedly having creampie sex with their constantly erect young cocks.