Animagami

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

(Source: Kodansha, translated)