Under the Innocent Sky has the story line that lives the lives of three different people and not making any sense between them until a third of the way through the anime. Even then a lot of things are still unexplained. If you can work your mind around the constant ecchi/fan service with copious amounts of added humor, the actual story is hard to piece together of the three main character. Even with all this running in circles the anime does with its story, in the final couple of episodes, it really does do a magnificent job of making sense of everything and why there are three main characters.
Watching through this anime, it's art has something different about to to most anime that I cant quite pick out. it used tones and gradients as much as it possibly can on both non and animated objects that make them blend quite well. But even the colors when going about the difference lives of the three protagonists, you see a different light cast on the same town depending on the character that currently in focus.
Music is fairly par with its play-though, not much throughout the anime however the few ones it does have add a nice touch to the scene regardless of how ecchi plagued it is. That being said, its ending and opening themes are quite upbeat and catchy. Sounds used for objects within the anime are actually sub standard as many can be picked out as easy to acquire stock, but this is rarely noticed if one is engrossed in the conversations that are had.
Character development is painfully slow and almost non existent until the final 3 or 4 episodes of the anime where more things are revealed and make a lot more sense of what the story thus far has been. It's hard to comment about without making spoilers evident, but it isn't an anime for those that watch for a well explained character plot.
Enjoyment factor is actually of incredibly great extent as the crude humor hits a new record height even with its copious amounts of nudity and one scene that borders so close to a sex scene it much as well be called one. It hold nothing back with ecchi elements from characters of all age and gender which adds an odd mix of both good and bad humor.
