Kyuo Ryu, once of the Septia troupe Phantom, hails from a lineage famed for subduing demonic beasts. Her grandfather, Jin Stolla, commanded Phantom until its destruction during a doomed mission to conquer the King of the Moon—a mythic demon beast invulnerable under lunar light. Discovering her slain comrades, she buried them alone and vowed retribution, first pursuing mercenaries before allying with Elle Ragu and Gau Ban. Together, they immobilized the creature until dawn sapped its regenerative might.

Swearing loyalty to Elle’s group post-victory, Kyuo endures as its least physically formidable member. She wields chulinks—razor-edged rings tethered to cords—to ensnare foes or strike from afar. Early training scars mar her arms, remnants of her struggle to master the Tomoway technique, a chulink discipline tied to her grandfather’s legacy.

Secret royal blood courses through her veins: her grandfather’s twin, King Iba Stol of Kuruda, claims her as his grandniece, vowing her protection.

Kyuo harbors quiet affection for Gau Ban, oblivious to her feelings, while Lohengrin openly courts her, entwining them in unresolved tension. Fearing obsolescence beside Gau’s burgeoning prowess, she trains relentlessly, determined to transcend her identity as a Septia.

Though her tactical ingenuity and refined techniques mark her evolution, self-doubt and the specter of physical fragility linger, shadowing her journey toward resilience.