Mio Kuraki, a devoted stepmother to her husband's child, receives shocking news one day—her honor student daughter has been arrested for shoplifting. To prevent her daughter's expulsion, Mio offers her body to the school's head teacher. But the head teacher spirals out of control, raping Mio right in front of her daughter. Humiliated and tormented, Mio suffers intensely, yet her female instincts overwhelm her as she repeatedly reaches climax after climax.