Akagi, Gunma

赤木軍馬

Gumma is a thoughtless individual. He resides with his father, his father's new wife, and their two sons, Shouma and Yuuma. He harbors hatred toward his father, holding him responsible for his mother's death.
Gumma and Tamotsu are childhood friends. He entered the race with Hiziri after being challenged by him, aiming to prove to his family that he can realize his dream.