As if, If we could have found the raws so easily webnovel would not be using so many Chinese Novels.

It takes training and can't be done instantly, I think..?

It's understandable that he focuses only in magika but stamina would be good to raise a little too.

Erasing memories is ok but make it so that if he gets stuck he can ask the system for guidance.

I hope he is low-mid chunin level and remains chunin before shippuden.