In 2029, a massive ground collapse occurred in the Mediterranean Sea, leading to the disappearance of crucial chemical elements like oxygen, carbon, gold, molybdenum, and cobalt from Earth's crust. Over the following sixty years, the global human population dropped by ninety percent. Scientists discovered that these missing elements had been shifted to a parallel dimension called Nega Earth. To rescue the planet, a specialized task force named the Element Hunters was created. Composed exclusively of children under thirteen, the team was selected based on the idea that young, flexible minds are necessary to access Nega Earth.