In 2029, a large scale ground 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 save the Earth, a special team called the "Element Hunters" is organized. All of the are under 13 years old, because young and flexible brains are needed to access "Nega Earth".
The book series offers humourous introductions to surprising aspects of living creatures, such as "raccoons don't really wash their food," and "dolphins would drown if they fall completely asleep."
(Source: Anime News Network)