I'll have to say this in advance, while watching the first few episodes I've never been more annoyed at the word "Bitch", because of how often I heard it.
Please remember that this is my own opinion about the series and whether or not you choose to think well of it is yours to think.
Story: I gave the story such a low score because the lack of luster it showed me, throughout the 12 episodes I found myself watching a circle of events followed by conflict and action, with little overall plot development. It was like replaying a level in a video game about 3 times in a row. Besides the repetitive feeling C^3 gave me, there were some aspects that gave it it's own unique feel. So far I haven't met a concept where cursed tools are from the fault of humans etc. Yet finding that theme mixed in with ecchi and harem, well, IMO it didn't mix very well.It attempted to mix a harem like aspect of cursed tools that were used for killing somewhat attracted to the main character, who didn't stand out very much either. Still, this anime plot line had its ups and downs, which persuaded me to finish the series.
Art and Sound: The art was pretty good, and I liked the music enough for me to put it on my "to download and listen to later" list. Conflict moments that included combat were displayed fantastically and animations for the "powers" each Waas/Worse/Cursed tool had were pretty cool.
Characters: As seen in standard ecchi/harem/highschool anime, the personalities of the characters were easily relate-able to similarly themed anime. The main character seemed as a more supporting role, and from each 2-3 episodes it centered around a different character but ultimately returning to Fear-in-Cube going through a similar circle of events.
I somewhat enjoyed this series. I managed to suffer through the cliche'ness of it all. Which brings me to a SPOILER. What kind of last ending boss fight was that? Completely rushed and cliche, the ending resolution pushed the story score down the lowest I have ever rated in a series. But in some ways I was enlightened with comedy and action. (Shout out to Konoe and her camera skills, XD). For people starting to watch anime and haven't seen many like this I recommend you watch it. If you have seen anime similar to this one, I wouldn't really watch it unless you are looking for a time killer. Just to state clearly the main flaws I found were: The amount of cliche moments, the repetitiveness of the plot line, and the awkward mix of ecchi/harem with bloody cursed tools with traumatizing backgrounds etc.
Overall, I wouldn't look down on this series too much, IMO I've just seen too many like it that are superior, and it bored me. If you were offended in some way, refer to my message at the top. But if not, have fun watching the series!
-Sincerely, Nebarto