What would you do if the fate of the world fell in your hands?

When Tom Weaver finally receives his class, he can't believe it.

He has been bestowed the Ultra-Rare Class of Controller, granting him the ability to control Core Stones of Dungeons – cores that are as important as electricity is to Earth. With little time to adjust to his new role, he finds himself battling for the heart of his village, against high-level monsters and dealing with the sudden arrival of Antoine Durand, a hero from Earth who is not happy to be away from home.

Overwhelmed, Tom is ready to become the hero he was always meant to be, but it will take more than a hero to face the existential threat that only a Controller like him can face.

The World Core is dying.