After her husband's passing, Rikako lives alone with her son. As he grows older, she begins noticing he's becoming aware of her as a woman. One day, she learns from her son's friend that he has no mother, and she agrees to play the role of his mother for a day. During this time, they cross the line into a forbidden relationship, awakening her long-dormant desires. Soon, she's seduced by the boy's friends, and her body gradually falls under their control. As pleasure takes hold, Rikako becomes completely submissive to these young men. A heartbreaking tale of emotional confusion and physical transformation.