I dislike harem anime and don't like fan service. And I only watched this because of the Anime Watching Challenge (ecchi/harem anime).
The story was ok, although uh, the sudden "she's the X??" etc. was like 'okayy"
It wasn't all that bad. The action was pretty good, the opening song was great, I am not a big fan of naked girls and stuff, but okay... I knew what I was getting myself into.
The art, besides that, was great, I mean, even with that it was pretty good too. As I said, I liked the opening song, the OST (original soundtrack) was good as well. Characters, well, they were diverse, although the harem was quite interested in the main harem guy, as harems usually work that way.
I did enjoy most of it. Honestly my biggest dislike was the fan service and harem, but it was made to be a harem anime, and so I did not factor that into my overall review score.
