This is a classic Japanese hentai. It is about a family made up of a mother, father, grandpa (fathers dad), son, and daughter. There really isn't much of a plot, it's basically just about the family having sex with eachother.
It was fairly entertaining and I laughed a few times, I didn't really feel like it was a waste of my time at all so I went ahead and gave it an 8/10.
The art was fine, just as detailed as any other hentai's you'll probably come across.
As I said before, there really wasn't much of a plot at all. Not that a plot is really necessary to make it a good hentai, but it usually makes it easier to watch the whole thing.
Pretty nice audio, accurate sounds and such, unlike some hentai's.
I would recommend this hentai to anyone that just wanted something interesting to watch for a few laughs, it's definitely not a waste of time.