Synopsis
In a world plunged into despair after being devastated by a lethal toxin called "shinobi"—which arrived on Earth aboard an asteroid—humanity has sought refuge in Kairiku, a region that was once the ocean floor. There, survivors struggle to shield themselves from the poison's deadly effects. Yet amid this darkness, a single beacon of hope remains: the sacred weapon known as Giga Road, along with the fabled warrior Yagyuu, both said to hold the key to countering the toxin's devastation. To save the world from its grim fate, Ame, the princess of a fallen kingdom, rises to take action.
