Tonight, I'm alone with my wife's friend...

His wife's college friend Hitomi decides to stay overnight due to work, and her husband Kazuo is excited. I had known about Hitomi for a while and was trying to find a chance to cheate. At that time, it seems that his father was injured by chance, and his wife Miyako has to go back to her parents' house. "It's inappropriate, but I'm lucky! I'll be alone with Hitomi until my wife returns!" Kazuo is suddenly excited, and pushes Hitomi down...