WARNING:MINOR SPOILERS BELOW

This gets 1/10 solely for the art alone.

Why? Let me explain:

Character development is nonexistant, backstories are not enough if the author truly wanted to write solid characters. Plus all of these backstories are incredibly boring and cliche. It seems that the author wanted to write badass characters without giving them any depth.

Action scenes were hard to follow. Seriously, the art is good, but the action and direction can be awful sometimes. Character designs are so so, but when I saw a killer loli with a gothic monk I cringed. Plus again, the author with his designs tries too hard to make everyone look cool and badass.

The story is so random. It seems that the author wrote the story as he went along. Prison guard suddenly became an ex-mercanary badass and prison chief is revealed to be an ex-hikikimori who just wanted revenge against someone who destroyed his PC. The ending was dissappointing since none of the characters were likable at all.

Shonen tropes. OMG, these shonen tropes, sometimes this manga was so stupid that I considered giving it up. It's on the same level as Bleach. In fact it's worse than the first 20 volumes of Bleach which were quite good.

Irrelevant side characters who do not contribute to the plot. i.e Yosuga and Toto Sakagami.

The reason why people rate it so high is because they decided to check the manga after the cliffhanger, so for some it's their first and the only manga they have ever read.

Despite all blood and gore, the quality of this manga is disastrous , however if you are a newcomer this will be a treat for you since you will have much lower standards than me.

I give it SHOUNEN-SHIT SEAL OF DISAPPROVAL.

Want a good shounen?

Read something like Shokugeki no Souma. Personally I found this manga a waste of time and it's dumb, but I won't deny that it's entertaining if you haven't read any manga in your life.