Kawamura, a manipulative student who profits from blackmailing his peers, finds himself framed for a crime he didn't commit and facing expulsion from Fujinomiya Private School. After uncovering a dark conspiracy run by the school board, he attempts to secure his position through the Student Body President. When she betrays him, Kawamura retaliates by ruthlessly dominating her, discovering a hidden physical secret and claiming the president as his personal slave.
Haruna, a devoted student who idolizes her mother, the school principal, finds herself trapped in a sadistic relationship with a mysterious "Master." When Haruna seeks indirect guidance from her mother, her mother's cold reaction—stating she would disown her daughter for allowing herself to be used—shatters Haruna's spirit. Feeling abandoned by the only person she loves, Haruna completely surrenders her will and embraces her role as a slave. As she descends into obsession, the Master expands his influence by bringing another student, Ayano, into his twisted circle.