Keiichi Hayama always dreamed of passionate sex with his childhood sweetheart, but one day she transformed in his dream into a mysterious beauty with perfect breasts and seductive eyes. The next afternoon, Keiichi returned from school to find that very same woman masturbating in his room! His mother introduces her as Reika. Since her parents died in a car accident, Reika has been taken in by Keiichi's family. But Keiichi knows there is some dark truth behind this woman, and he has a hunch his prophetic dream wasn't a dream at all.