Keiichi Hayama always dreamed about hot sex with his childhood sweetheart, but one day she transformed in his dream into a mysterious beauty with perfect breasts and a seductive eyes. The next afternoon, Keiichi came back 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's some dark truth behind this woman, and he has a hunch his prophetic dream wasn't a dream at all.