sentences:  Sigma felt betrayed and left his family soon after to take the path of a Makai Priest, meeting his brother years later after their father died.Though Leo offered the armor to him, Sigma refuses and reveals his intention to construct the Magōryū Idea to end the Horror menace once and for all.With the aid of his childhood friend, Mio, Sigma found a power source for Idea in the Horror Gyanon.