For Yumi, a wife in the prime of her life, her husband's work assignment is unbearable, and before the year is out, she ends up having an affair with another man. However, her neighbor, Koichi, secretly enjoys spying on her affair and devises a plan with his bad friends... One day, Koichi visits Yumi, and without asking for her consent, he entangles her in specially made restraints and violates her voluptuous body. Deprived of her freedom, she is constantly used as a toy by these naughty boys...