19-year-old former member of 'Fuji●Dan', Mimura Sae, is secretly followed as she provocatively flaunts her exhibitionist tendencies at a mixed-gender hot spring. At a chosen onsen destination known for public exposure, she openly displays her D-cup breasts to nude couples and groups of men. She further excites the men by exposing her genitals and boldly enticing them into blowjobs. Even after returning to the inn, Sae's wild behavior doesn't stop—her actions escalate further, delivering increasingly intense scenes.