Isamu Yaegaki is a member of Forza Esterna, the independent organization and is one of their best fighters. He is a human-devil hybrid and the son of the late exorcist Masoami Yaegaki and the Devil Cleria Belial, thus also making him a member of the Belial family. He is the current wielder of the Divine Sword Futsu-no-Mitama as well as the Sacred Gear Meteor Star.