In 2029, a large scale ground sinkage occurred in Mediterranean Sea and chemical elements such as oxygen, carbon, gold, molybdenite, and cobalt suddenly disappeared from the earth's crust, causing forests, buildings and life itself to disappear.
The human population was decreased by 90% in sixty years.
Research reveals that the elements have been flowing into another Earth on the another side of a dimensional wall that can only be accessed by those with flexible minds.
A team of Element Hunters is formed to return the elements to Earth, and all the members are under 14 years old because young and flexible brains are required to access to "Nega Earth".