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In the fight between the Dragons of Heaven and the Dragons of Earth, the dream seer Princess Hinoto predicts the end of humanity. A central entity, 15-year-old Kamui Shirou, is to choose whether to ally with the Dragons of Earth and destroy civilization to protect the planet or with the Dragons of Heaven to save mankind. Following his mother's last wish, Kamui returns to Tokyo after six years of self-imposed exile. There, he attempts to steal the Sacred Sword from the temple protected by Kyougo...