21-year-old G-cup "Momo" is a college student who works as a black-haired twin-tailed underground idol. Despite having a boyfriend, she gets approached while walking on the beach and repeatedly refuses, saying she's here with her boyfriend—but ultimately gives in when tempted by the generous reward offered. Inside the Magic Mirror Van, she reveals herself to be a model-level beauty with an irresistibly cute voice. When introduced to the challenge—help a man masturbate and make him cum within 15 minutes for 150,000 yen—she shows immediate interest. She mentions her boyfriend cums in under a minute, clearly surprised by the serious nature of the situation. First curious about the masturbatory device, she's shocked by the unexpectedly huge cock, and amazed at how hard it gets from her handjob. Tempted by the money, her breasts slip out as she gets more involved. The abnormal situation excites the underground idol to the fullest—she presses against him from behind, giving a handjob while teasing his nipples and breathing into his ear, quickly bringing the massive cock to full erection. Unable to resist, she takes it into her mouth, making it even harder. When talk turns to bareback sex, she becomes intrigued. Asked, "Are you sure you won't cum?" she gasps as the thick cock plunges into her shaved pussy. Moaning in excitement as he thrusts into her, she says, "My hips are moving on their own!" When asked if he's a virgin, she covers her mouth and arches her back in climax. He cums inside her—her first ever creampie—hands pressed against the mirror as she's taken doggystyle, gushing uncontrollably. She climaxes like a train station bento, overwhelmed with pleasure. Then, in missionary position, he pounds into her fiercely, making her scream in adorable ecstasy. "You're a virgin, yet you're so amazing..." she mutters, completely dazed.