In 2029 a massive ground sinkage occurred in the Mediterranean Sea, causing the sudden disappearance of chemical elements, oxygen, carbon, gold, molybdenum, and cobalt, from the Earth's crust. Over the next sixty years humanity’s population declined by 90%. Scientists discovered that the vanished elements had been siphoned into a planet called “Nega Earth” in another dimension. To prevent further catastrophe, a special team named the Element Hunters was formed. All members are under 13 years old, as youthful, flexible minds are essential for accessing Nega Earth.