One day, a handsome girl who barely spoke to him in school suddenly contacts him. "I've become an onahole girl, come visit me♪ I'll give you lots of service!" she cheerfully messages. Though he feels uneasy about the mismatch between his shy personality and her outgoing nature, he can't help getting excited at the possibility of a sexual relationship with her. Full of anticipation and nervous energy, he heads to her shop, where she delivers the dirty, hands-on service he hoped for. But as she keeps pushing increasingly extreme add-on services, his wallet quickly empties. Then, she reveals a "secret backroom option," escalating things far beyond his expectations—forcing him into full unprotected sex against his will!