Already the story is falling apart. If elixir can't heal lost limbs, you would have to be insane to be disappointed in getting a Healer Hero. How many times are they going to be crippled on the way to the demon king without a healer?
It just makes no sense that their new sensei can take down his disciple by rushing at him when the guy literally has the inhuman reaction time to stop 2 bullets phasing in inches from his head, and then he's taken down by kaname and shuka when kaname is inferior to his own master the JP rank...
Really, the entire fight went by with MC losing the entire time and it never occurred to him to use his only active skill. Sure he doesn't have an INT of 1?