Do you believe there are worlds beyond our own? What if I told you there was a world where children and teens were chosen to live in? A world where everyone loves each other and gets along? This world is called Nezumika. But being a Nezumikan comes with a price. As a Nezumikan you are a demon slayer who will protect the real world from dangerous demons wanting to hurt regular humans. This series follows the adventures of the Nezumikans as they try to defend their world and the real world from these said demons.