Its not that he cant use magic, but he has little control of its power, shown when he nearly killed the guy he had a mock battle with before stopping himself
Just went to find the raws and it seems to be at 18 chapters + prologue, and was updated recently so, no tags for seasons so don't know how long it goes for, but at least its not just a promo
That was adorably tragic at the end there, imagine being called Spongebob for a year while being an amnesiac in space and then gaining those memories back
So the plot is objectively stupid but I do like how the prequel's main survivor has turned in to the antagonist. I'll use my grudge curse to change the world, pretty creepy superpower in a way.