Rei Kuroshima is a meek and obedient female teacher with a beautiful appearance. Due to her personality, she reluctantly agrees to the impure requests of a male student, ultimately cooperating with his ejaculation. This is witnessed by the principal, who resembles a caricature of vulgarity. Summoned to the principal's office, she is threatened with dismissal and coerced into a relationship with him, essentially a sex contract. Though initially reluctant, she eventually transforms into a vulgar bitch, dripping with bodily fluids and surrendering to the principal's summons with a smile, wetting her crotch before orgasming.