In the novel it was better, MC didn't create a pillar of fire but was found out by the classmate for using magic in his roo, the same way, the police came to him after he tested his powers in open sea, far away from anybody, they used their spiritualist to localize him, the cops were waiting on the beach and the rest was more or less the same.
In stuff I read in the novel MC never uses his power to repair something, healed the dumb classmate yes, but never fixed a wall, I presume the author didn't want to give him that cheat too, and I think is good because a certain development later should have a different outcome if he could repair everything with magic.
That aside anyone could track his house, so it was stupid to do in the first place in the manga to make that fire tower.
The novel isn't half bad, I slowed down after a certain twist that I felt gone against the rules it set itself.