Its a shame, but the most enjoyable part of this serie would have to be the very begining of the ending song, aside from that, I didnt really got to enjoy anything else. I even feel I was too generous with my rating.
I would only recommend this anime if you are very bored and want a lot of random fanservice (tentacles included), because I doubt you will watch it for either the characters or story, but that is up to you to decide.
