Maya Hibino presents as an ordinary school teacher, a human disguise meticulously maintained by the serpent yōkai Orochi-Onna. During her time in human society, she becomes the focus of Nezumi-Otoko's romantic interest.

Her true form reveals an anthropomorphic serpent: pale green scales cover her body, contrasting with a dark grey underside. A rattle tips her long tail, and she possesses a pair of slender arms. Her face features a forehead horn, yellow sclerae with narrow black pupils, a snout housing a pink forked tongue, and long, wavy red hair. This form is distinctly curvaceous, with large breasts and a slit around the midsection resembling legs.

Orochi-Onna originated from a fractured fang of the serpentine deity Yato-no-Kami, broken after Enma-Daiō defeated the deity in ancient times. She functions as a loyal minion to the serpent god.

Personality-wise, Orochi-Onna developed genuine affection for Nezumi-Otoko, bonding over their shared experiences of loneliness and enduring prolonged hardship within the human world. Identifying deeply with his struggles, she often expresses her fondness by attempting to pull him into her coils. This emotional investment surfaces starkly when facing a duty-bound sacrifice; her despair stems not only from fulfilling her mission but also from the impending loss of Nezumi-Otoko's affection.

Her abilities include secreting poisonous acid, wielding sharp claws, enhanced agility, and exceptional flexibility that allows her to coil around targets for restraint. She can shed her skin, including her hair, instantly and possesses the capability to transform into her human guise, Maya Hibino.

Her narrative arc concludes with this sacrificial act to complete her mission. The sacrifice carries significant emotional weight due to her attachment to Nezumi-Otoko, intertwining her profound sense of duty with personal loss.