Maru lives in the City, a peaceful society where people are no longer bound by the limits of body, mind, space or time. A girl named Coco, of the Aidara Tribe, lives in the Zone, a dangerous region that is also home to remarkable beasts. The two come from opposite worlds, and the story centers on their search for a way toward a future they can share. The result is a science fiction action story built around that contrast.