Koi to Obake no Sodate Kata

Ten years ago, Yorito's parents and their familiar, Rurimaru, were killed while battling evil majinas, leaving his older brother injured. Now, at 18, Yorito is responsible for defending the village alongside his own familiar, Himaru, who is not yet strong. Yorito is determined to become powerful enough to protect his older brother, though it appears the brother is hiding something from him.