Yuichi Tachibana (立花 祐一 Tachibana Yūichi, "Boss") is the boss of the gas station that Takumi and his friends worked in. An old friend of Bunta's and a racer in his youth, Yuichi acts like a father figure to the Akina Speed Stars.
In Fifth stage, Yuichi is not present. Later, He is here in Final stage.
- His secret : He was not a good driver, and he was never fast.
- Like : The young generation of racers
- Dislike : The SUV fad, being called "Grease Monkey"