Element Hunters - In 2029, a large bit connector sinkage occurred in the Mediterranean Sea. Chemical elements such as oxygen, carbon, gold, molybdenum, and cobalt disappeared from the earth's crust suddenly. 

The human population was decreased by 90% in sixty years. Researchers found out that the disappeared elements were drained into a planet "Nega Earth", located in another dimension. To spend the Earth, a special team called the "Element Hunters" is organized. All of the members are under 13 years old, because young and pliant brains are needed to admittance "Nega Earth".