Don't let the name fool you. This is not a masterpiece.
My first T-Rex hentai was an excellent one, but this one... no it is not even a bad hentai:
Story: Story side we have normal hentai story. Sex between sister/mother with brother(not blood related btw). Nothing demanding or special. EDIT: I remembered there are lots of non-sense in story too. e.g. start of episode 2 when every student is dressing like a some fantasy demon bitch.
Art: Here goes the problem. Character design sucks. Females only have big boobs and butts. Voice are bad. Animation sucks. Colors are washed out. Not good at all.
Scenes: Worst of all. Most of them are not arousing. Scenes with mother are worse.
Non-sense: Lots of anal sex. Really? Anal sex? how can a woman enjoy anal sex?
No not good. I don't recommend watching it.
NOTE: For good hentai take a look at my anime list.