After watching it, the story put a question mark over my head. I looked at the reviews and they don't match what I just watched. It's a two part hentai and they really don't match up much. The first part had Yuuji and his mother playing a dice game. Then the game had them do sexual thing to each other. At first they don't know why they could not stop themselves, but then enjoyed called each other lovers. Afterwords they walk in the living room and the sister didn't know anything about it.
Then in the second part it shows sister (Aoi) walking in just when they about to play the game. But shes' some kind ghost that can't do any thing, and just watches them have sex. She wakes up and it seems to be a dream, like it didn't happen. As the story goes on she keeps remembering about the dream and finds the dice game. She just picks up a card ask Yuuji about why did one of the cards from said masturbate on it. The card makes her start playing with her self in front of him. They had feeling for each other and had sex, and are lovers now.
So is it showing two different endings or what? Please answer this is bugging me.