Ichiro is a young boy who has been protecting his younger brother, Jiro, from the "Doraks"—creatures that threaten humanity. One day, after being attacked by a Doraks and pushed into a desperate, helpless crisis, the "Teras Foundation" appears before him—an organization that connects humanity and fights back against the Doraks. The foundation utilizes the power of the wolf monster—"Lycan". Witnessing this overwhelming power, Ichirou throws himself into battle in order to protect his brother...