Kaijuu Decode: Aidara no Yubiwa

Set in Sakai, a youth named Maru lives in the peaceful city, a society freed from the restrictions of the body, mind, space, and time. In contrast, a girl named Coco, a member of the Aidara Tribe, resides in the Zone, a treacherous area also inhabited by incredible beasts. The story revolves around two opposing characters seeking a path into a shared future.