What I liked about watching this anime was the strange awkward atmosphere that gives you. The story is "no one knows" but the background music is fab. This anime is good for the kind of Humor in it that is also weird sometimes but got the taste of difference.
I liked this one because of the bass guitar idea which had extremely gave me the feeling of some METAL music there but it was enough to hear the riffs in the background for sometime.
The fact that you finish the anime and the story is not much clear to you is fine by me.