21-year-old D-cup bikini gyaru "Mami" appears in this episode! Despite having a boyfriend, she faces off against Yoshisan, a highly educated and intelligent college girl. Suffering from past trauma, Mami has declared herself permanently suffering from ejaculation dysfunction (delayed ejaculation), but she's invited to participate in a cash prize challenge where she listens to men's problems and helps them reach orgasm. While killing time at the beach on a windy day, Yoshisan suddenly shows up and introduces the challenge: "Help a man with ejaculation issues masturbate and make him cum within 15 minutes to win 150,000 yen!" Mami reacts with surprise: "Huh? He can't cum?" and adds, "I shouldn't laugh, right?" showing her humble and cheerful personality. She mentions having had around eight partners before, some fast, some slow, and says she prefers "average." When receiving a handjob, she happily notes, "It got hard~." Drooling, she performs 69, her pre-cum highly viscous and noticeable. Suddenly going down on him, she produces loud, slurping sounds—unexpectedly intense for her cute face. She provocatively asks if brothels never let him finish, then delivers aggressive blowjobs with challenging piston movements. When pushed down, she hesitates: "Huh? Bareback? You're really gonna do it?" as a large cock penetrates her. "So hard," she moans, "your hip movement is... Wait, you're really a virgin?" Each time her G-spot is hit, she gasps "Ahnn, ahnn." Finally, she experiences what might be her first-ever creampie ejaculation—inside her! Doggy style, then standing doggy with her facing outward, creampie juices squirt out powerfully. Riding him cowgirl-style, she starts moving her hips, but gets pounded hard from below: "If you thrust like that, I'm gonna cum!" Missionary, railroad position, and relentless pounding end with a massive facial cumshot—spurting, gushing, again and again. "Yoshi-kun, you're definitely not a virgin, right? wwww."