Kamui Shirō is the series protagonist,[1] a powerful esper believed to be the one who holds the key to the fate of the world. He never knew his father and was raised only by his mother, Tōru of the Magami Clan. Kotori and Fūma are the children of the Togakushi Shrine. They were raised by their father Kyōgo after their mother Saya died under mysterious circumstances. The siblings friendship with Kamui stems from a promise made when the three met as children: to always protect one another.
Following Kamui's arrival, two factions vie for the young man's allegiance, convinced his power will assure their victory.
[edit] Dragons of Heaven
The Dragons of Heaven (天の龍, Ten no Ryū?) are the first to contact Kamui. They are picked from various schools of religious thought in Japan, including the Shingon buddists of Mount Koya and the Onmyoji. Also known as the Seven Seals (七つの封印, Nanatsu no Fūin?), the Dragons of Heaven are guided by Hinoto, dreamgazer for the Legislature of Japan. The Seals are the protectors of the kekkai (結界, kekkai?), spiritual barriers that hold the fabric of nature together. As long as the kekkai survives, Judgment Day is postponed.
[edit] Dragons of Earth
The Dragons of Earth (地の龍, Chi no Ryū?) are the counterpart to the Seven Seals in the X universe. Collectively, they are regarded as the Seven Angels (七の御使, Shichi no Mitsukai?), messengers of destruction. Their mission is to unleashed death and famine so the Earth can be cured of the plague of humanity. The Angels are free agents with no sense of camaraderie and assembled by Hinoto's sister Kanoe, secretary to the Governor of Tokyo.