Aeon is species of the eponymous organisms that have evolved and inhabited Earth with an innate connection to element-based magical powers. They commonly captured and trained by humans, primarily for slavery and/or to be used as a weapon. Nearly all Aeon are able to manipulate energy or matter through supernatural means, with the specifics of these abilities determined for each Jurik largely by their elemental "type" Most Aeon physically resembles animals, though some resemble plants or objects with animal-like facial and other features. It is not clear whether most Aeon classified as natural living things, though they are often treated as non-living organisms. Nearly a century has been passed since the first generation Aeon coming to Earth. Now, there is a violent and bloody massive war called Great Aeon War where many people died along with Aeon by using them in the war to fight as well as using man-made weapons such as tanks, fighter planes, guns, etc. Most of the kid become fatherless, and it is hard enough for their mother to raise a child alone in a war. Therefore, once they reach become 10 years old, every child (the poor one) must make an important decision in their life; either join the school and prepare themselves for the war, or helping the professors and researchers to capture as many Aeon as they can, or simply living without any support either from the government or from their parent.