Miyuki Ichinose, daughter of the Ichinose Racing Team president, leverages her family's professional motorcycle racing ties to become an accomplished rider on her Honda VT250F. As a high school peer to central characters, she immediately establishes her technical skill by defeating rivals Gun Koma and Hideyoshi Hijiri in a race. Demonstrating strategic insight into racing dynamics, she later recruits Gun and Hideyoshi to form a two-rider team for Suzuka Circuit's four-hour endurance race.

Her personal history includes the traumatic loss of both parents in a vehicular accident, influencing her motivations and relationships. She develops romantic feelings for Hiro Okita, Gun's close friend, and their relationship evolves into marriage. During the narrative, a former racing rival abducts her, leading to a near-assault resolved only through Gun and Hiro's intervention. Undeterred, she continues contributing to racing, including pit crew duties at the Suzuka endurance event.

Her arc concludes when she suffers fatal injuries in a motorcycle traffic collision, shortly after attaining happiness with Hiro, countering prior narrative expectations of stability.