Without relying on the heroes, I see…. well in this world, whenever something happens, they summon heroes or rely on the Seven Star Heroes, or at least that’s the image I get.
So it’s a School made from searching for a method to become stronger without relying on those heroes.
Thinking about it normally, to leave the world to the Four Saint Heroes and the Seven Star Heroes, only 11 people, is an act of sheer madness.