In the
ancient times, the
moon god
Tsukuyomi, who is jealous of his sister and
sun goddess,
Amaterasu, transforms into the eight-headed serpent named
Orochi and intends to destroy the
Earth. Fortunately, the sea god
Susanoo defeats Tsukuyomi and seals his power inside the enchanted
Sword of Dark Clouds. Tsukuyomi's father,
Izanagi, fears of his son causing chaos again, seals him inside the ice prison and sends it far away from the Earth. Many years has passed,
emperor Keiko of
Yamato feels a great loathing for one of his twin sons,
Ousu, after their births. Being convinced that this feeling is a premonition, Keiko orders the mysterious shaman Tsukinowa to kill Ousu, yet his efforts are spoiled by Amano Shiratori, the
phoenix and the White Bird of the Heavens. Keiko's sister, seeing this as a clear sign of
divine intervention, takes it upon herself to raise Ousu. 10 years later, Ousu is stopped by his aunt's servants Genbu and Seiryu who prevent him from enter the mysterious cave. At night, Ousu finds a mysterious
comma-shaped gemstone, which teleports him to mysterious realm where he meets King Bullhead, who tells his prophecy that Ousu will become a warrior of the gods once he possessed
three lights before he teleports Ousu back to the cave. When Ousu has matured into adult, he is given pardon by Keiko and allowed to return to the castle. However, not long after, Ousu's mother empress Inahi dies from her mysterious illness. This sends Ousu's brother into a rage and causes him to attack Ousu, who defends himself and accidentally kills his brother with his gemstone in the process. Keiko, furious at these events, orders Ousu to leave the castle and not return until the barbarians living in the
Kumaso domain are dealt with. Ousu makes haste to complete this task, stopping off at a shrine on his way where, after a quick battle, he befriends a young priestess named Oto Tachibana who joins him on his journey. They, along with Genbu and Seiryu, raid the castle, killing king Kumaso Takeru, who attempts to
sacrifice Oto to Kumaso's god Kumasogami, which Ousu destroys him with his gemstone, and receives
the shrine mirror from Amano. Following this defeat, Ousu gains the title "Yamato Takeru", yet fails to win the acceptance of Keiko. His aunt, though, warns him of a great threat looming overhead, as Tsukuyomi is poised to return, endangering the Earth. Ousu must prepare to halt this from occurring. She tells him to bring the Sword of Dark Clouds to her for safekeeping as it holds a good deal of Tsukuyomi's power. He secures the sword but is tricked by Tsukinowa, who summoned Kaishin Muba, disguised as Inahi and revealed himself to be one of Tsukuyomi's fangs, into surrendering it, thus inadvertently restoring Tsukuyomi to full power. Tsukinowa also reveals that it was him who killed Inahi and Ousu's brother to frame Ousu, causing Ousu mortally wounds Tsukinowa in retaliation. The
solar eclipse falls over Earth as Tsukuyomi blots out the sunlight and reclaims the Sword of Dark Clouds from Tsukinowa, who reverts into his fang form after he died, unleashes chaos to the Earth. Ousu is told by King Bullhead, who reveals himself to be Susanoo that his divinely ordained destiny is to destroy Tsukuyomi with the aid of Oto, who revealed to be the incarnation of Amaterasu. Susanoo tests Ousu by having him pull the Sword of Karasai from a stone, and tells him that it is the only weapon that can kill Tsukuyomi. Together, Ousu and Oto are transported to the moon to face Tsukuyomi, who transforms himself into Orochi once again. Ousu and Oto are aided by Amano to launch an aerial attack on Tsukuyomi, but are overpowered. As they have both lost their lives, Oto sacrifices herself to gives Ousu her life energy. Ousu realizes that Susanoo's prophecy has come true, as he now has the shrine mirror, the Sword of Karasai, and Oto's spirit. Ousu transforms into a gigantic warrior named Utsuno Ikusagami, who fights and defeats Tsukuyomi, who reverts into his human form after defeated. With Tsukuyomi's defeat, Oto is restored to life. Susanoo telepathically tells Ousu to seal Tsukuyomi into his gemstone, then cast it into the outer space, causing the eclipse ends and the sun again shines on Earth. As Ousu and Oto mount Amano to fly home to Earth, Keiko says he wants to see Ousu. In the end, Ousu and Oto reluctantly part ways as Ousu returns the Sword of Dark Clouds at Yamato. ==Cast==