Reika Hou is one of three pilots entrusted with operating an ancient mecha bound to humanity’s fate, its power intertwined with cycles of judgment and rebirth. She synchronizes exclusively with the mechanized titan’s third form, Kaiser Neptune, a colossal entity engineered for aquatic warfare and linked to forgotten civilizations that forged guardian deities to oppose the mecha’s cataclysmic capabilities.

Her demeanor remains calm and congenial, grounding the team dynamic amid the more forceful dispositions of her co-pilots. Collaborative by instinct, she prioritizes unity in their shared mission, though her past before joining the unit remains undisclosed. In battle, she dons a streamlined suit tailored for agile movement, its design functionally distinct from her allies’ gear.

Central to thwarting antagonistic forces aiming to exploit the mecha’s apocalyptic potential, she confronts adversaries wielding elemental guardians of fire, wind, and beyond. These clashes define her battlefield role, though the unresolved arc of her journey leaves her origins and ultimate destiny open within the scope of her documented engagements.