The series follows the complete sexual degradation of the prim and proper teacher, Rin Nanase, at the hands of her delinquent students. Initially blackmailed with a compromising video, Rin is forced into her first humiliating sexual encounter. This single act spirals into a relentless series of gangbangs where the entire class takes turns using her body. Each episode details her descent deeper into depravity, her resistance crumbling as her pussy and asshole are ruthlessly stretched and filled with load after load of thick cum. She's forced to perform deep-throat blowjobs until she chokes on their cocks, her face plastered in semen. The arc's climax sees her spirit completely broken, transforming her from a terrified victim into a cum-craving whore who willingly spreads her legs and begs her students to pound her holes and drench her insides with their seed, finding her true purpose as their personal classroom fuck-toy.