Fifty-year-old mother Ayako is treated poorly by her husband and feels exhausted by daily life, yet deeply values her bond with her son. As the day approaches for her son to leave home after getting married, Ayako grows increasingly lonely, clutching his underwear and masturbating alone to ease her longing. On the very day of her son's wedding, she can no longer restrain herself and takes action. She wants to have her beloved son just one more time...