First off, the MC is pure evil, he is cold, calculating and OP from the start. He has zero emotion towards people, and despite a selected few, he would kill everyone withouth second thoughts. It's interesting (at least for me) to be able to see inside his thoughts and inner monologes. He has some level of autism, plus being a psychopath makes him a very interesting and suprising character.
Okay, enaugh of the MC, let's talk about the side characters. There are a few things that annoy me, like the student-teacher romance. I understand that it was needed for the teachers's character development, but still, it's not my cup of tea but luckily it's not a very importanp part of the plot. Otherwise the support characters are suprisingly well written.
Okay, but what about the plot, you ask? It tells a story after the MC has defeated the world's strongest superhero, but after a few weeks, he finds himself bored. To pass the time, he enrolls to a newly opened superhero academy, where he tries to be a "good" student, but suprise suprise, he can't really hold himself for long.
So, the bottom line is, READ IF YOU LIKE: OP and calculating MC from the start, light read, little bit of comedy, ruthless MC
DON'T READ IF YOU: have high morals, find mass killing/torture disturbing, want a hero MC.
P.S: sory for any misspells/grammatical errors, I swear I'm trying...