Mao Hamasaki, a schoolgirl, was raised by her mother's second husband. After her mother dies from illness, her stepfather's descent into madness begins. He assaults her and subjects her to relentless sexual abuse. Unable to endure it any longer, Mao escapes, briefly tasting freedom and peace—until it's shattered. One day, a private investigator hired by her stepfather appears. Far more sadistic than her abuser, this man is a depraved sexual beast who takes her torment to unimaginable extremes.