The world will end in 1999-it has been preordained. Tokyo will crumble, bodies of the dead will pile up, and all life will end. This is the wish of the earth which has being suffering the painful ramifications of human destruction. Still, there is another possible future and a hope to prevent the end of the world. Fourteen people, each with their own special powers, will take their place on the two sides of the battle-The Ten no Ryuu protecting the world as it is and the Chi no Ryuu who seek to fulfill the wish of the earth.

Japan is the location of this battle because the Earth's seven Kekkai (or shields) are all located there as important buildings like the Diet Building or Tokyo Tower. If these Kekkai fall, the earth's last line of defense will be gone and it too will fall. There is no need for the Chi no Ryuu to spread their destructive efforts to anywhere else. These Kekkai are different from the kekkai each of the Seals possesses.

The Ten no Ryuu (or the Dragons of Heaven and also called the Seals) have someone they wish to protect, and so they fight to preserve the world in which that special person lives. To do this, he or she is able to create a kekkai-a barrier shield only people involved in the end of the world can enter. Each person's kekkai has a different shape though they are all about three square kilometers. When a kekkai is set up, the people are taken to a different plane so that any damage done to the surrounding area does not affect the real world. Should the Seal die or get heavily injured, the kekkai breaks down and all the damage which happened in the shield appears in the real world.

The other side is the Chi no Ryuu (or the Dragons of Earth and also called the Angels). For various reasons, they choose to destroy the world of man to allow the earth to rest and heal itself. Their personalities range from misanthropic computer genius to suicidal dreamseer. When mankind is wiped out, they too will die, but they either don't care or welcome oblivion. They are more likely to work alone than the Seals, and their loyalties vary as much as their personalities.

At the center of this battle are two boys. The first is Kamui-a boy kind, fragile soul, hurt and isolated by fate until the promised day. The other is Fuuma-Kamui's best friend and twin star. Kamui chooses which side he wants to fight for, and Fuuma takes the opposite side. At first Kamui seems to disinterested to choose, but eventually he decides that he wants to preserve the world where Fuuma and Kotori (Fuuma's sister and Kamui's other best friend) live. Unfortunately, by choosing, Fuuma took the other side and killed his sister.

Seiichirou's destiny pulls him into this battle for the fate of earth. He fights as a Ten no Ryuu to protect the world in which his family lives. Although he may die in this battle, he will do his best to live for the sake of his family.