Miho Shirakawa is a 28-year-old nurse employed at Gourikis medical clinic. She maintains a calm and mature demeanor, yet occasionally reveals a playful streak. Her personal interest lies in practicing capoeira. Shirakawa shoulders significant financial strain from college student loans. To address this debt, she secured a loan from yakuza member Dobu, creating a cycle of financial reliance. This pressure drove her to steal medication from Gourikis clinic for black market sales. She shares a past romantic relationship with Dobu, complicating their financial dealings.

Shirakawa's interactions with Hiroshi Odokawa mark a key aspect of her story. During a critical moment, she accidentally intervened when Yamamoto attacked Odokawa, stopping further violence. This act placed her within the web of events surrounding Odokawa. After Odokawa's visual agnosia—which caused him to perceive humans as animals—resolved, he now sees Shirakawa's true human form: a woman with brown hair and blue eyes. Their relationship developed positively following his recovery. Shirakawa continued her involvement through the depicted film events, consistently appearing in her human form. The resolution of her financial issues and criminal activities remains unaddressed across available materials.