After her parents' death, the innocent Koharu Hinomoto is taken in by the Asaoka family, finding herself trapped in a house of beasts. The three depraved brothers, Genzou, Masaru, and Arata, immediately see her as their new shared plaything. The series chronicles Koharu's descent into a debaucherous hell as she is systematically broken and used to satisfy the brothers' every perverse whim. Night after night, she's subjected to relentless gangbangs, her orifices ruthlessly stretched and filled by their thick, throbbing cocks. They take turns pounding her tight pussy and ass, covering her face and body in sticky loads of cum. From forced oral servitude where she deepthroats them to the brink of asphyxiation, to humiliating double penetrations that leave her a twitching, creampied mess, Koharu is powerless to resist. The arc follows her transformation from a terrified victim into a mind-broken slut who learns to crave the very degradation she once feared, her days and nights a blur of non-stop, brutal fucking and cum-drenched submission.