Again, interesting premise. Then it continued on to become total shit.
It's not original, but the whole "gaining power through endless training and unlimited willpower" in the beginning was what brought me here.
Heck the part of him asking to get hit over and over to brute force learning the skill was good.
And although not much, the main characters (the initial 3) were slowly getting fleshed out albeit very little.
Then magic school arc started and author said "fck all that previous shit, here have all the spells and tons of new characters and no time at all to flesh any of them out just have quirks and traits stuck on them"
The least the author could do was let him struggle for it like he did with swordsmanship, but I guess he got lazy