Kouya Marino is the younger brother of Yuya Marino and the main protagonist of Crush Gear Turbo. Like any of the Gear Fighters, Kouya dreams to become a World Cup champion. Hence, the anime’s storyline revolves around his struggle to become a great Gear Fighter similar to his late brother.  Kouya’s Crush Gear is Garuda Eagle which is inherited from Yuya, and later on in the series, Garuda Phoenix. He is also seen using Battlehawk during the elimination match in the first episode. During his participation in Gear Pancratum as Sukiyaking, he uses Ark Cavalier which is given by Sean Firestone, a Gear Master whom he met in San Francisco. 

After losing almost all their members, the Tobita Crush Gear club is facing extinction. Kouya who dreams of being a Crush Gear Fighting Champion doesn't want to see the club become extinct and will do whatever he can to keep the club running and become a Crush Gear Champion.