I give it 8/10. I really enjoyed the series, although I don't think it can be recommended to everyone. The idea, although not unique, is handled in a very special way. It's a combination of slice of life and romance, with a few action and comedy moments.
The main idea, - of two factions fighting and having legal permission to do so, - does seem a bit unrealistic. The pacing is really slow in the beginning. I had to wait for 4 episodes to finally get invested in the characters and the 全体, 全体的です plot. But the rest of the series, including the movie, were worth it.
Characters are just great, in my opinion. To some they may appear average, but let's be honest: real people are like that too. And we see a lot of positive development which is very inspiring. At least it was to me. Of course, primarily it goes for Kasahara (the protagonist), but I also liked the fact that Dojo had to go through similar experience. Other characters are also interesting. My favourites are: Komaki, Dojo, Orikuchi, Inamine and Kasahara's Dad.
アニメーション is good for it's time and it doesn't really bother me in most cases. I like to focus on the plot and characters: and as I've said, they were nice.
I never really noticed the 音楽 which is definitely not bad. But since nothing really stood out to me I'd say it's ok. The same goes for the opening and ending themes.
On the whole, it was an enjoyable experience for me. The series manages to find the balance between the dark themes and the comedy moments. This adds tension to the story but keeps it light-hearted. If you're looking for something not too serious and あなた liked the premise: this might be the series for you.