After divorcing her husband, Eri chose to find comfort in her own body. One day, her nephew Tsuyoshi—her sister's son—accidentally discovers her. The sight of his aunt's pale skin and soft breasts ignites excitement in him. Unable to hide his arousal, Tsuyoshi stares, completely captivated. Noticing his reaction, Eri takes his cock into her mouth, inviting him in. In that moment, a new relationship begins between them.