Progress
After getting the explanation from Arba, Kai proceeded with his training. Of course, Arba's training came first. He tried to do everything possible according to Arba's instruction.
He wanted to finish it as soon as possible but to no avail. When he tried to control his Magic, he ended up either letting it go like usual or exploding.
Obviously, Arba didn't have any confidence in Kai succeeding in one day. Her prediction was around thirty days for the minimum control.
After Arba's training during the day, Kai needed to face another hellish training that drained his mental energy. He had experienced it during his stay in the Oni Village, and his impression remained the same. Mind Magic indeed exhausted him even more than physical training.
Kai, of course, didn't complain and accepted all the teaching. The knowledge completely destroyed his perception of the world. It turned out that the world was more complicated than he thought.