I watched this anime two times, never got bored. The anime is so unique compared to every other anime. I really recommend watching if you enjoy exciting animes that include interesting plots (that includes gangs), and loveable characters.
Personally, my favourite character is Masaomi Kida, one of Mikados (the main character) close friends, he has a very outstanding personality and he never gets boring in the show and my least favourite character is probably Anri, though I have no real problem with her she seems to get really boring throughout the show and its hard to get attached to her as I did with all the other characters. This is obviously just a personal statement though, you can love or hate both of these characters just based on your feelings towards them ykkkkk.
Enjoy watching if you get the chance!