Logos is an Astral spirit affiliated with the Magic Academy, existing independently of a physical form. He serves as the rival to Espre, another Astral who observes Mocha's group concealed within a sword. As Espre's counterpart, Logos engages in an intense rivalry fueled by their opposing positions within the Astral hierarchy. This conflict becomes secondary when the Dragon's Head artifact triggers a scheme to revive an otherworldly force capable of rewriting history. Facing this shared existential danger, Logos and Espre unite to counter the threat directly at the Tower of Wind. There, Logos channels his unspecified magical expertise as an Astral to help neutralize the reality-altering entity and prevent history's unraveling. His documented narrative concludes with this critical alliance resolving the immediate crisis during the OVA's climax. No subsequent appearances or developments occur in other known Ozanari Dungeon media.