In Kamui, Amaterasu assists the Oina tribe to defeat two recently revived demons, Lechku and Nechku, who were creating a deadly blizzard that threatened to destroy the island. In addition to this, Amaterasu discovers that Issun ran away from his home of Ponc'tan to escape his responsibility of being a Celestial Envoy—a messenger of the gods—and his grandfather; additionally, the duo learn that Shiranui was in fact Amaterasu in a previous incarnation, who sacrificed herself to kill Orochi with the help of Issun's grandfather. After defeating Lechku and Nechku, Amaterasu discovers the wreckage of a flying ship made of iron: the "Ark of Yamato", trapped in the frozen plains of Kamui. Waka appears and reveals himself to be a member of the Moon Tribe, a long-living race who used the Ark to sail the stars. They helped the Celestials—minor and major gods—escape from the Celestial Plain after Orochi invaded, but the demons snuck onto the Ark beforehand, allowing them to kill the rest of the Celestials before the Ark fell to earth, releasing the demons upon the mortal world. Amaterasu boards the Ark alone, defeating the spirits of the felled demons onboard. Amaterasu finds Waka in battle with Yami, the machine-esque leader of the demons who led the genocide of the gods ages ago; Waka is knocked unconscious and Amaterasu takes his place. After a long battle, Yami drains her power and nearly destroys the Celestial Gods. Before it can do so, Issun accepts his role as a Celestial Envoy, and encourages all those they have helped to send their thoughts and prayers to Amaterasu, who regains her powers and defeats Yami, ridding Nippon of all demons. Amaterasu and Waka take control on the Ark and sail back to the Celestial Plain, determined to rebuild the land of the gods.