A transfer student from Tokyo with an aloof demeanor who conceals a traumatic past of being disowned for pursuing manga. She partners with Kaoru to access the tunnel, seeks artistic talent, and later becomes a manga artist who eventually waits for and reunites with Kaoru after he escapes.
Anzu reflects on her childhood aspirations and the passage of time.
Koharu acts as an early antagonist, testing Anzu's resilience through harassment.