Ai Itou is a main character, the girlfriend of protagonist Gun Koma. Raised by her father, a motorcycle racer, she developed an early passion for the sport. Maturing, she entered local races, rapidly establishing a reputation through impressive skill. She continuously hones her abilities, actively striving for greater proficiency.

Her driving ambition is to become a world champion in motorcycle racing. This fuels her persistence against the challenges of competing in male-dominated circuits, where she faces gender-based skepticism. She demonstrates determination by racing against male competitors, proving gender does not preclude success. Her strength and resolve inspire fans, contributing to her popularity. However, her talent also attracts jealousy and envy from fellow racers, reactions which do not deter her pursuit of her objectives.

Throughout the series, she maintains her relationship with Gun Koma, supporting him while advancing her own racing career. Her character arc emphasizes perseverance and dedication as she navigates professional rivalry and personal relationships without compromising her ambitions.