Two 21-year-old college student coworkers, Yumichan and Youkochan. Yumichan has been in a two-year relationship with her boyfriend, while Youkochan has been single for three years—an unusual situation. The energetic gyaru girls, walking along the beach, are invited to a special seaside cottage to enjoy a BBQ with their part-time job store manager. However, a surprise event kicks off—an erotic Russian roulette game with a cash prize. The store manager clearly has masochistic tendencies, which becomes a key part of the game's appeal. With their eyes covered by blindfolds, the girls take turns giving handjobs. The game involves dirty talk, drooling, nipple play, and other lewd girl-on-girl action. They're allowed to touch the penis, and during the opponent's handjob turn, they must pleasure the manager and push him toward ejaculation. It's revealed that the manager loves lotion, and his pre-cum is prominently displayed. As the game progresses, electric stimulators on the nipples and TENGA sessions are added, increasing both girls' arousal. They ride his face, grinding their hips vigorously—intense action continues, and with the prize at stake, their erotic techniques intensify. Yumichan wins, and Youkochan is subjected to a punishment game. When she touches the male performer's huge cock, her body trembles uncontrollably. With heightened sensitivity, she writhes her hips, pleading, "Don't look…" Yielding to the pleasure disguised as punishment, Youkochan exclaims, "That's unfair—I want it too!" She dominates by teasing the man's nipples, then mounts him with force, grinding her hips. The room echoes with the sounds of friction and moans, blending the scent of pussy and the sea. "This isn't punishment—it's a reward!" they cry out together, as they're pounded repeatedly, filled with creampie after creampie, forced to give blowjobs, made to stand, then pounded again in an endless cycle. Youkochan confesses, "I've been holding back," while Yumichan reveals her inner aggressive girl: "I'm just the same as always—I want regular sessions with him." Both girls display an astonishing level of eroticism far beyond what anyone would expect from college students!