H-cup beauty Ruka hides a soft, alluring body beneath her pure and elegant appearance. Standing by the seaside, her charm is so strong it makes you want to stay over at her grandma's house. When asked about her relationship with her boyfriend, she admits they only hook up occasionally, yet openly shows her love for sex. A challenge is proposed: count the wrinkles around her anus, and if she can endure it, she'll win 30,000 yen. Even when told sun exposure on her butt hole has health benefits, she resists at first, citing her boyfriend—but ultimately can't resist the money. Her fair, untouched body is oiled up by expert staff, who carefully wipe and count every fold around her holes with cotton swabs. During the process, she's anally licked, her big tits swaying as pleasure and shame mix. Moaning "I-I might get addicted to this..." while her breasts are groped, she starts gushing from fingering, then repays with mind-blowing titty fuck. Joking that her boobs can't quite squeeze his cock, she then slurps him off with wet, eager fellatio. A thick cock plunges into her soaked pussy, making her squeal cutely as if saying, "I'm your slave now." Riding him in cowgirl, her fair, gorgeous ass slaps down hard; then in doggy, her anus fully exposed, he relentlessly pounds her most sensitive spot—cumming, cumming, CUMMING! Unable to hold back, he finishes by blasting a thick load straight into her mouth.