Girl Hell (1999)

Seventeen-year-old Misaki endures a life marred by tragedy and abuse. Abandoned by her mother and forced to care for her bedridden sister, her home life becomes a battlefield of psychological terror, dominated by a father whose actions cross into the realm of the unthinkable. At school, Misaki finds no solace as her closest friend succumbs to the allure of degradation for material gain. The culmination of her suffering arrives through a series of brutal assaults, each encounter dragging her further into a vortex of despair, with only a mentally ill homeless woman offering a semblance of maternal comfort.