Keisuke Izumi appears as a minor character in the OVA. Zeus serves as the primary antagonist, actively pursuing Arisa Sakura, the reincarnation of Persephone. Zeus seeks to obtain her unique power to revive the Titan, driving the central conflict. Aware of Arisa's identity and capabilities from the beginning, his sole motivation is harnessing her power regardless of the consequences. This places him in direct opposition to Hades' reincarnation, who protects Arisa. Zeus's relentless pursuit creates significant tension, establishing him as a persistent threat. His character lacks detailed backstory or development within the given information. The connection between the identities "Keisuke Izumi" and "Zeus" remains undefined.