Yuka Aoba is a married woman with a chronically ill husband and a teenage son. With almost no intimacy in her marriage, Yuka constantly suffers from sexual frustration. One day, she learns that her son has broken up with his girlfriend because they couldn't have successful sex. Deeply shocked, Yuka decides to take matters into her own hands and personally provide him with real sex education. However, her pent-up sexual desires, suppressed for years, begin to erupt—driving her actions into increasingly intense and uncontrollable territory.