Ryouko Hanuki, a spirited dentistry student, sports long brown hair, sharp black eyes, and a distinctive mole beneath the left corner of her chin. Her bold fashion leans on a black short-sleeved top paired with denim hot pants, accessorized with gleaming gold accents: a necklace bearing a white tooth pendant, star-shaped earrings, a wrist bracer on her right arm, and vibrant red high heels. Fond of revelry, she embraces uninhibited energy when drinking yet carefully vets companions to balance spontaneity with safety. At a Shijo Kiya bar, she observes a stranger deftly thwarting unwanted advances and promptly invites the woman to join her and her friend Seitarou Higuchi for a night exploring Kyoto’s vibrant streets. Her daring extends to a supernatural drinking contest, where a sip from an otherworldly cup infects her with the "Ri Haku Cold." Unknowingly, she becomes the outbreak’s first carrier, spreading the ailment across the city. Her name echoes her essence—"refreshing child" (Ryouko) and "feather-perseverance" (Hanuki), the latter mirroring her tenacious spirit.