In general, the manga is good, it reads in a sigh and entertains you until the end. I like the two unexpected turns that happen and how they are resolved and the ending seemed quite adequate. However, it was not what I expected. I thought they would leave me with their mouths open in the "I have read all volumes for nothing" plan, like many other manga, but no!

The drawing is quite ugly although it improves with the passage of the volumes. However, it is quite realistic and expressive.
There is too much blood and some scenes are very beasts. But I think in this manga, with this plot, it's perfect.

Perhaps the worst has been that they end up telling many lives of many students, that although it is interesting to know about them and understand them, sometimes that part becomes a bit heavy.