Yuka raised her only son, Shuichi, single-handedly, but her excessive indulgence made him selfish and spoiled. Shuichi frequently bullied his classmate Hajime. When Yuka learned of this, she stepped in to apologize on her son's behalf, but Hajime couldn't forgive so easily—he decided to take revenge by sexually tormenting Yuka's body. He then reveals the truth to Shuichi, pressuring him with the words, "Hey, lend me your mom for a bit..." as compensation. A shocking story unfolds, entangling maternal bonds and vengeance in a brutal clash of humiliation and desire.