Tsuyako Yamamoto is 50 years old. Once a popular beauty whose voluptuous body captivated countless men, she now lives estranged from her husband, with whom she hasn't communicated in a long time. Her only joy was watching her son grow up. However, one day, an incident involving her son shakes Tsuyako to the core. Initially unable to accept her son's actions, she gradually learns the truth behind his behavior, and a new, unexpected emotion begins to stir within her.