Rieko is a single mother who raised her son, Shuichi, on her own. However, due to her overindulgence, Shuichi grew selfish and began secretly bullying his classmate Hajime. When Rieko discovers this, she resolves to apologize on her son's behalf, but Hajime takes advantage of the situation and angrily demands a physical form of apology from her. He forces her into sexual servitude as retribution. Meanwhile, Shuichi, unaware of the full situation, finds himself cornered and plots revenge. His first move? Closing in on Hajime with the words: "Hey, lend me your mom for a bit."