I have to say off the bat that I did enjoy it. It's got a fairly original storyline -- in "our world", gates to some other dimension or something started opening and monsters (classic stuff mostly -- goblins, worgs, etc.) came through. At the same time, people began "Awakening" with powers to combat them that are ranked from S down to E. Not everyone has these abilities.
So, our hero Sung Jin-Woo (here you can see that this originated as a South Korean web novel, though the anime is by a Japanese studio), is known as the Weakest of hunters. But, he's smart and dedicated and does his best, partly because this 20 year old is supporting his teenage sister and trying to pay his mother's medical bills. She's been afflicted by some kind of weakening/coma-like sickness related to the Gates.
He does his best event though he's weak and constantly gets injured. But, on a particularly ill-fated mission in a double dungeon, he's brutally killed after being left by the rest as more or less a sacrifice, even though he was the one who managed to keep as many of them alive as possible. But it's some kind of special thing and when he awakens (back with his missing limbs), he's gone through some kind of a transformation. In a world where your skills are set at awakening, he's now the only one with the ability to level up a la game style complete with status pop ups and loot drops.
Anyway, through the first twelve episodes he's trying to navigate that, support his family, and grow stronger while also fending off the lawlessness of the whole "what happens in the dungeons stays in the dungeons" which forces him to kill humans or be killed.
By the end, he's levelled up as some kind of necromancer, a group of Hunters has uncovered that the invaders on Jeju Island have been growing/changing, and there's at least one badass S rank that wants to kill him because he was there with the dude's evil brother died (after trying to kill Jin-woo; don't shed any tears for the psycho killer...he deserved it).
It's got good pacing, an engaging protagonist, good (though very Kill Bill bloody) art, and compelling stakes. I'll watch the next half when it comes out definitely. I think a live action is in the works, though I honestly am not sure if something so gruesome would translate well. Might be too disturbing.
