Minako Kirishima is a 42-year-old private middle school teacher, highly regarded by students and parents alike, maintaining the image of a respectable educator. However, when her husband falls terminally ill and mounting loan payments threaten her home, she swallows her pride and requests financial assistance from the school. The school's principal, seizing the opportunity, blackmails her with the ultimatum: "I'll lend you the money, but in return, you must submit completely to me." Drawn into sadistic domination and masochistic training, the earnest and honest Minako is forced into absolute obedience. Gradually, drooling and broken, she transforms into a loyal, animalistic teacher, surrendering her dignity. Throughout this process, her sense of self erodes as she embraces a new existence defined by submission and control.