Keirin cyclists compete not only on the track but also in the complex machinery of their sport. Hanako Izumi dreams of becoming a professional Girls Keirin racer, while Takara Kibana works as a temporary management staff member during bicycle racetrack events. Both young women share a deep fascination with the construction of racing wheels, a craft that balances precision engineering with raw athletic performance. Their meeting, two buds or hana opening toward the same passion, blossoms into a new story exploring the world of competitive cycling from a fresh perspective. The spinoff volume also contains a standalone story focusing on Susumu Kagawa, the sworn friend and rival of main series protagonist Rinta, depicting the bond between Susumu and his uncle and master Onji.