Mion, a female teacher in the doldrums of her relationship with her boyfriend, gets excited by the robust body of a student's father during a home visit and indulges in carnal lust with him. The student witnesses this lewd act. Later, blackmailed Mion follows obscene orders. Gradually, shame turns into excitement as she craves the student's cock. In a forbidden relationship, she openly displays her desires. Even her boyfriend gets excited by the sight. They expose their twisted lust and confirm their love for each other.
