After school, Rion finds herself receiving one-on-one instruction from her teacher. In reality, this is a trap set by the teacher for his own sadistic sexual training. No matter how many times she pleads "Stop," with no other students around, her resistance is futile. Taking advantage of the situation, the teacher forcefully advances on her with lewd intentions. Trapped and with no escape, Rion gradually loses control over her own emotions. Eventually, she begins to desire being abused by the teacher, transforming into a submissive pet who obediently yields to his cruelty.