The series follows Sukumi, a prim and proper student council president with a classic tsundere personality who secretly harbors an insatiable, exhibitionistic libido. Her world is turned upside down when a male classmate discovers her secret account where she posts lewd photos. He uses this as blackmail, forcing her into a series of increasingly humiliating and public sexual encounters. The arc sees Sukumi's initial resistance crumble into debauched pleasure as she's relentlessly used. From being forced to masturbate in the library and giving blowjobs in a classroom, to being gangbanged by the boy's friends, every episode pushes her deeper into depravity. Her tsundere facade breaks down completely, revealing a shameless slut who gets off on being degraded and having her tight holes filled with cum, ultimately embracing her destiny as a public-use sex toy.