Kyōya Kazamatsuri masquerades as a human boy with short black hair, orange irises, and fair skin, clad in a green-collared yellow shirt, pale green shorts, and green shoes tipped white. This guise conceals his true identity as Yato-no-Kami, an ancient serpent deity plotting to reduce the world to primordial rock and soil. To infiltrate human society, he fabricated familial ties with Hana and her mother through implanted memories.

As Yato-no-Kami’s power ascends, Kyōya’s form warps into a serpent-human hybrid: his lower body elongates into a scaled tail, limbs stretch unnaturally, and teal scales with dark spots emerge across his torso, marked by seven salmon-pink tomoe symbols. A spiral-patterned horn protrudes from his whitened hair, his eyes shift to yellow with black sclerae, and claws replace his hands. His ultimate manifestation is a gargantuan eight-headed serpent with pale green flesh, crimson markings, and breath that petrifies living beings.

Kyōya’s origins trace to an ancient clash with Enma-Daiō, who shattered his eight souls. One fragment was bestowed to humanity, another imprisoned within Enma-Daiō himself. Centuries later, humanity’s ethical decline erodes these seals, reigniting Kyōya’s malice. He schemes to reclaim his power by abducting Hana, whose bond to Orochi-Onna—a being born from his fractured fang—holds key to his apocalyptic ambitions.

Kyōya displays unwavering ruthlessness, unmoved even by Orochi-Onna’s sacrificial defiance. His capabilities span shapeshifting, memory manipulation, venomous secretions, and petrification-inducing toxins. His mere presence incites yōkai to frenzy, while his physical strength enables him to obliterate entire terrains without strain.