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He made his debut on 30 April 2011 against Tochigi SC, when he came off the bench to replace Atsutaka Nakamura. He scored his first goal with Kyoto against Ehime FC. However, his most important goal was scored against Yokohama F. Marinos in the semifinal of the 2011 Emperor's Cup when, after having started the match on the bench, he scored the last goal from Kyoto in the extra time, closing a 2-4 win against Yokohama which meant that Kyoto would play its first Cup Final since 2002 Emperor's Cup.
After five years and the captain armband obtained in Kyoto, Komai left in January 2016 to join Urawa Red Diamonds.