Water, earth, fire, and wind. People who can control one of these elements are called firebenders. As a result, four nations and tribes were born in the world: Water, Earth, Fire, and Air.

Among them, only the Avatar-Avatar can master all four elements at the same time. It serves as a bridge between the four nations and maintains the balance of the world.

However, just a hundred years ago, the Avatar-Avatar suddenly disappeared. One of the four nations, the Fire Nation, launched a war of aggression against the other three nations, which lasted for nearly a hundred years.

At this time, Kahn traveled through time and became a young firebender...