New teacher Mana Sakakura finally stands on the podium at her alma mater. Kind-hearted, she secretly works at a snack bar at night to send money home for her sick mother. One day, while preparing for class, an unfamiliar letter slips out from between her textbooks... From that day forward, Mana's teaching life is drastically changed by humiliation and degradation as she is gang-raped by her students...
