Wataru was about to marry his girlfriend, but something kept bothering him—her mother, Sayuri. His unease about her becoming his stepmother wasn't just discomfort; he worried that once he married her daughter, Sayuri would be left all alone. One day, by chance, Wataru caught Sayuri masturbating. Her sorrowful expression and luscious skin were burned into his mind, and unable to resist, he forgot about his fiancée and, in that moment, pulled Sayuri tightly into his arms.