The series follows Yuuta Yamano, who is dating his childhood friend, Shinomiya Natsuha. [3] He's overjoyed when their relationship finally becomes sexual, but he's completely unaware of her secret life. [1, 3] Natsuha has been routinely having raw, unprotected sex with a delinquent, Masaru, finding his aggressive fucking and massive cock far more satisfying. [2] The story arc details Natsuha's descent into pure sexual hedonism as she constantly lies to Yuuta, sneaking off to get fucked senseless by Masaru. The episodes explicitly show her getting bred, taking huge loads of cum deep inside her womb, and her pussy dripping with another man's seed while she feigns innocence with her boyfriend. The climax involves her complete submission to her primal lust, choosing the raw pleasure of getting her guts rearranged and being filled with cum over her vanilla relationship, ultimately abandoning Yuuta for a life of being Masaru's personal fuck-toy.