For a bit of backstory, Tsuchiya is the only junior in the Automobile Club, and the others are all seniors. So while they've all know each other longer, Tsuchiya is more of a newcomer, as well as a kouhai.

Team Leopon become Team Muuton

BrokenEagle98 said:

For a bit of backstory, Tsuchiya is the only junior in the Automobile Club, and the others are all seniors. So while they've all know each other longer, Tsuchiya is more of a newcomer, as well as a kouhai.

Tsuchiya is Kawaii