One of the best things about this anime is the way it takes the basic premise of any hentai "all women are there to have sex with" and deconstructing it to hell and back.
Scale of best to worst for each episode; 2, 4, 1, 5, and 3. Episode 2 was the best overall with episode 4 close behind. You could completely skip over episode 3.
Overall, Inma Youjo is one of the best examples of plot-heavy hentai you are likely to find.
