FAX-531 - Showa Era Erotica: Crossing the Forbidden Line Between Father and Daughter

I'm a bit dissatisfied with the lazy setup where the marriage is already broken and the wife is sleeping with a younger man. Life is full of suffering. The husband lives with the pain of being unable to satisfy his wife sexually due to his paralysis. The wife, knowing his feelings, can't resist her urges and drifts into an affair, suffering daily from the guilt. Wouldn't it have been better to depict that kind of marital dynamic? If the goal of an AV is just to see sex scenes, people will eventually get bored. If they could weave sex scenes into a compelling story, wouldn't we get a masterpiece? Am I asking for too much? If I just take it as a standard AV, I'd give it an extra point.