Years after losing her husband and with her daughter now married and settled, Yuri has gradually grown accustomed to life alone, feeling deep down a sense of relief, as if a heavy burden has finally lifted. Her daughter and son-in-law seem happily married, and she's begun hoping for a grandchild. But at night, the sounds coming from their room—her daughter's moans and cries—slowly awaken something inside her. Unconsciously, she soaks her underwear, curiosity turning to arousal. Driven by desire, she begins sneaking into their room late at night, secretly watching the couple's intimate moments while pleasuring herself.