The storyline of this hentai is very bad; it starts off with no real basis, and you can't quite understand what was going on at all.
An apparently mad scientist has been expelled from a researching institution due to his interest in "evolution". Some time later, he calls his ex-assisstant in order for her to go pay him a visit and see his new discoveries. He has, apparently, found the key to evolution in the human being (in my opinion, it would be more like a regression), and things have turned out for the worst... Watch it in order to know what happens (although you don't
need to be a genius to find out).
Art and animation in this series is nice, although it could have been perfected a bit more by applying better shadings and better colors.
Sound's alright. As usual, hentai producers only add sufficient sound as to get the episode going, not focusing much in this aspect.
Character development is almost null. A tiny bit is explained about the mad scientist and maybe a couple more characters; that's it.
Graphically, the hentai is fun to watch, with interesting scenes and shots. It could've been much better, though.
P.S.: For the producers, just because it's a hentai, it doesn't mean you don't have to come up with interesting stories! Come on, gives us hentai series with good, well-developed plots!