As the ruler of the last surviving human nation in Rhir, Othius the Fourth continues a two-hundred-year war against monster tribes and demons. While other nations send their own armies to support him, his people has never known peace and the war is slowly and steadily being lost.
This led him to attempt building a Fifth Wall, in order to expand his lands and constrict the access the demons and monsters had. For this he had his mages conduct a ritual to summon legendary heroes from another time. However, the America Group arrived instead.