Azumi Shibukawa, operating under the alias Hairpin Red, is a central figure dedicated to protecting the Okayama International Circuit. She is one of five individuals possessing the ability to transform, enabling her to combat mysterious creatures drawn to consume the Mimasaka Liquid energy source beneath the racetrack. Transforming into Hairpin Red signifies her role within the specialized team responsible for safeguarding spectators, staff, and the facility during these attacks.

She operates under the tactical command of Ken Horibe, the Race Controller coordinating their defense against these threats. Azumi Shibukawa embodies a determined and proactive approach, defined by her personal declaration: "I'll put a stop to whatever scares me, no matter what anyone else says." Her personality aligns with traits focused on achieving goals, a drive for competence, and a blend of adaptability and individualism, identified as INFJ and Enneagram Type 3w4. She possesses distinctive pink hair.