First: He cannot leave the school. The only way to leave this school is to get all your power taken away by the school and become normal person. Do you want to fight someone who has ability to take away all your power?
Second: the school may be the only place where he will get clues about how...
The only purpose of all these heroes, even the main char is keep their hero's powers from being taken away by the school. Those heroes may be good people but after a taste of power, do they want to become normal powerless people again? Those heroes seem rather get killed in this school than let...
He took 50 years each just to train basic stuffs like walking, eating with left hand,..., He might train to hold for who knows how many thousands years :haa:
Huh? I recall in chapter 1, the school clearly states that the school can erase any hero powers and make that person becomes normal person if he/she chooses to not attend the school.
That's why the main char cannot show off his power because he is on the mission to restore the cat to its...