It's kinda like Batman vs Superman the manga. Bear with me.
It focuses on two main characters, one born with fantastic powers, the other an ordinary human who wants to be a hero of justice.
The kip with powers was raised by his "grandfather" who happens to be the world's most awesome Hobo. The kid uses his powers to rescue people in exchange for money. He later becomes involved in huge conspiracy involving artificial monsters.
The other main is a rich kid who wants to be a hero. He uses the skills and gadgets approach. After some events he becomes involved with fighting the monsters as well, but from a different angle.