A female teacher, Nozomi, falls victim to delinquents after helping a bullied student, earning the wrath of their gang. Summoned to a classroom late at night, she is tied up and brutally raped. Though she tries to maintain her pride as a teacher, her body succumbs to pleasure, and she eventually yields to their domination. During class, after school, or at awkward moments, she is repeatedly humiliated and abused at their whim. With each encounter, her inner darkness grows deeper.