Yomi, a dark medical ninjutsu user, seeks to revive a demon known as Mouryou. Yomi is the survivor of a fallen shinobi clan who worshipped Mouryou and used his powers to create a Ghost Army of stone puppets. With the army, they almost managed to conquer the entire continent, but a priestess from the Demon Country managed to separate Mouryou from his physical body and seal him. Yomi has released Mouryou’s spirit again in order to try to conquer the world and establish again the Thousand Year Kingdom that his clan had envisioned. Yomi offers Mouryou his own body to temporarily contain his spirit. To unleash Mouryou’s true powers, they must first travel to Swamp Country where Mouryou’s physical body is sealed. Yomi once again resurrects the Ghost Army to march towards Swamp Country, destroying everything in their way. He sends his four henchmen, Kusuna, Shizuku, Gitai and Setsuna, to assassinate Shion, the current high priestess of Demon Country and the only one who can seal Mouryou away again.

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