For one thing, the pacing, in my opinion, is just terrible. The series will have an episode with a battle, then an episode with an explanation. All the explaining is extremely annoying. Sure, I like knowing what is going on, but usually the explanations have nothing to do with whatever event is occurring at the moment, and it will still leave me several unanswered questions as to what exactly did happen.
Another thing that seriously annoys me are the characters. Takeshi is just extremely gullible, and I found myself calling him an idiot more than once. Kurumi is your typical "damsel in distress" who doesn't seem to really have any useful powers. Ida just acts first without any thought, but we don't even see much of him anyway. Then there's Mui, who I can't really find anything noticeably wrong with her, except that she causes drama between Takeshi, Kurumi, and her.
Then, there's the romance aspect of this anime that I find uncalled for and unnecessary. It provides fan service, I know, but it is not needed at all. The anime would operate just fine without it, and all it does is take up episodes where something important could be happening (or an explanation -.-).
The ending was also rather open-ended, leaving you to try to figure out what actually happened, or happens... I might just force myself to read the manga in order to try and see if what happened is explained, because the ending of the anime just left me with even more questions than before. Overall, this series is something I wish I didn't spend my time to watch. It is not something I would recommend to watch.
