One day, Reiji, an ordinary boy who could be found anywhere, was indulging in his erotic fantasies and masturbating, as he always does, when he suddenly felt as if someone was watching him. He was so curious that he looked around and noticed a girl looking at him from the side, wondering where she had come from. Reiji was surprised and girl looked dissatisfied. He thought that he was dreaming. Even in this supposed dream, it's too embarrassing to masturbate in front of a girl you don't know. The girl looking even more upset said, "if you're going to look at me like that, why don't I help you do it?" Reiji stunned by this unrealistic situation allows the girl to touch him but she isn't capable of it. "Don't worry, I can do naughty things" she says before slipping through the wall, and a little later, his older sister who was sleeping in the next room enters. Looking completely different, it was if she had been possessed. The ghost using his older sister pushes him down, and with a lot of hip swinging, Reiji loses his virginity. The possessed sister leaves the room and the ghost comes back. "I'm going to stick around because I think I'll enjoy your company," she said with a smile... [From official site]