Ulyte Mest, younger brother of Babalun Mest and uncle to Dagmeyr Mest, thrives as a beloved instructor at Holy Land Academy, his cheerful charisma and penchant for teasing—especially about romantic entanglements—endearing him to many. Yet beneath his playful exterior lies a life steeped in covert dealings. A Core Crystal, implanted by his father in childhood, binds him to Rea Second/Neizai One, an artificial human forged to counter Babalun. As Rea’s influence grows, the Crystal triggers a relentless physical decline, compelling Ulyte to covertly aid Rea’s shadow war against his brother.

To resist Babalun, Ulyte wields a device stolen from the Barrier Workshop, weaponizing its data-erasing capabilities during their clashes. But each use hastens his body’s deterioration, edging him closer to merging irrevocably with Rea. Herbal tonics brewed by Kenshi Masaki stave off his crippling fatigue, a fragile lifeline strained further by Ulyte’s habit of prodding Kenshi with irreverent jests.

Despite his enigmatic reputation, Ulyte’s sharp intellect and talent for navigating social intricacies earn him unwavering respect, veiling his true allegiance to Rea’s cause. His defiance extends his waning lifespan just long enough to confront Gaia, deploying the stolen device to unravel Babalun’s machinations before his body succumbs. This final act cements his role as a linchpin in thwarting Gaia’s threat, completing his merger with Rea as both mission and fate.

Tensions with Dagmeyr, fueled by clashing loyalties, linger until Dagmeyr begrudgingly recognizes Ulyte’s impact through Kenshi’s deeds. Ulyte’s legacy, entwined with his artificial origins and symbiotic fusion with Rea, etches him as a tragic architect of victory—a man whose laughter masked sacrifices that reshaped the conflict’s tide.