Hiroya Okuyama (奥 山 広 也 Okuyama Hiroya) is the number 1 (or Zero 1) of Team Spiral.
Okuyama too believes in Ryuji Ikeda's "Zero Theory" and is disappointed when he won't be able to use his car's full potential due to the rain.
Okuyama, unlike Ikeda, is very arrogant and confident in his abilities. He also refuses to greet Project D upon meeting them.
His battle against Takumi Fujiwara is raced in the team's first fog battle, but the result was similar to Takumi's battle against Nobuhiko Akiyama of the Saitama Alliance: Takumi used half his potential until the first hairpin, where he left Okuyama behind.
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- Hiroya Okuyama also appears in MF Ghost as a recurring character. He also became a good person, indicating that his defeat by Takumi changed him completely.
- Hiroya Okuyama is also a playable character in the Team Spiral Arc Rival Side. He can be played to re-enact his race against Takumi Fujiwara. He is one of the few antagonists to be playable in the game.