Kaori serves as the FX Rider for the Big Wave racing team. Her duties involve managing pit communications during races and providing mechanical support. She demonstrates practicality and resourcefulness, notably when the team acquires a new engine from a benefactor. Kaori harbors unexpressed romantic feelings for the team's driver, Makoto, though she openly chastises him for reckless driving during high-stakes situations.

During the FX Open Cup race, Kaori actively coordinates pit stops and monitors race progress. Her role extends beyond technical tasks; she offers emotional encouragement to Makoto, especially when tensions flare with rival racer Natsuo Sawai. This underscores her dual function as both a logistical coordinator and a source of team morale. Her interactions reveal a no-nonsense attitude tempered by deep loyalty to her teammates.