Minori Ozaki visits a massage parlor that's been making waves online. Drawn in by rumors of the older male owner's special services and tempted by the offer of a free first session, she decides to give it a try. Inside, the atmosphere feels suspicious, but she figures she can just leave if anything inappropriate happens—so she takes the plunge. The treatment turns out to be far more erotic than expected, with meticulous full-body care culminating in vaginal massage using a thick cock. Though it initially felt like a questionable fantasy, her body becomes addicted to the sensation. After returning home, Minori finds both her mind and body deeply shaken, already craving to experience it all over again.