A decent start to the series. 

If I had to summarize it's plot in a few lines: it's a progression fantasy about a boy with a certain handicap, trying to overcome the challenges borne of it to forge his own path among The Sacred Arts, that will enable him to become powerful in combat. 

I'm not sure if I'm too interested in the magic system itself. But there's no heavy number crunching like in LitRPGs, and it's explained well enough without it bearing down upon the character and plot progression. So it is indeed a well-done progresion fantasy.