To earn money for her son Koushi's tuition, mother Shiho works hard every day. One day, upon returning home, she witnesses her son being assaulted by a group of unfamiliar young men. Rushing over in panic, her son confesses he's been bullied at school. Though shaken, Shiho attempts to confront his classmates, but instead of backing down, they not only beat Koushi but also begin sexually assaulting Shiho right before his eyes, groping her voluptuous body. The atmosphere turns instantly tense, leaving Shiho with no choice but to fight back—for her own sake and to protect her son.