Akio was obsessed with a nightly fantasy of seducing his best friend Wataru's mother. The woman in his dreams was Yuka—kind, warm, and possessing an irresistibly voluptuous figure. Unconsciously, Akio had grown jealous of his friend, fixated on the idea of claiming Yuka for himself. One day, he finally decides to turn his fantasy into reality. With the seemingly innocent words, "Hey Auntie, let me give you a massage," he sets his plan into motion—the phrase marking the beginning of her downfall. Yuka, hearing those words, remains completely unaware of their true, sinister meaning.