a quiet girl who has no connection with popular, sparkling first-rate girls. on the surface, she says she doesn't like flashy things and keeps her distance, but deep down she admires them. such a quiet girl is invited to a first-rate girl's home party! as she hesitates, she heads to a room in the apartment, and the ones who greet her are flashy men. eh!? what should i do? the quiet girl is confused. but it's too late to go back now. she enters the room thinking she'll just play a little and then leave. then she ends up drinking alcohol for the first time... alcohol that she drinks with the sole purpose of not ruining the atmosphere. a head that becomes intoxicated and unable to make rational judgments. in front of her eyes, the flashy men are doing vulgar things with the first-rate girls! i want to go home... but... as if reading her mind, the first-rate girl drags her into erotic acts! when she realizes it, she's naked and countless men's hands are groping her body! what is this! amazing! the serious quiet girl's lewd side is gradually awakening! i can't believe i'm going to have group sex! her excitement is at its maximum with such an unordinary act! the quiet girl, shaking her hips like crazy and cumming like crazy, is slowly sinking into the swamp of dangerous play...