Shiho, a mother, works hard to earn money for her son Yasushi's college tuition. One day, when she comes home, she finds Yasushi being assaulted by some unknown young men... She rushes in to intervene and finds out that her son was being bullied at school. Shiho can't hide her shock, but her classmates raise their hands. She tries to stop them, but the despicable group doesn't just hit Yasushi, they start groping Shiho's voluptuous body right in front of her...