The Weak Ranker System

There once was a teenager in a society where everyone had superpowers in order to defeat the dungeons that spawned on the Earth. The main character is the son of a famous family of rankers (superheroes) who unlike the rest of his family who has very overpowered ability, he has a power called 'weak force'. He is treated as a disgrace of the family, only being treated as a human being by his grandfather who is the head of the family. Only this old man believes in the main character, and gives him a special gift before he departs on a special mission. "Welcome Weak Force user. Would you like to accept the 'Training Wheels' system?"