The story is pretty good. It could of been a lot better if it summed up a good amount of the things going on. Which is why I gave it the lowest score of the categories. The story is there, and its probably in the light novels. What I will say is this, if you enjoy action/comedy type anime it's definitely worth it.
The art to me is fantastic. On par with some of the other stuff out there. Visually appealing to the eyes.
The sound is great. I gave this the highest because the music is INCREDIBLE from this anime. The OST alone is worth it if you can find it. The voice acting is great as well. I can sit here and enjoy writing this review while just listening to the OST.
Character stories definitely could of used a lot of time to work on. I'm not going to complain though because it got the basic point across.
Overall, I think this show is worth watching at least one time through. I love action/comedy genre the most. My enjoyment and my laughing moments were definitely worth the time I spent watching it. My rewatch value on this is actually pretty high. If you came for something serious, it's best to go another route.
