Kōji Seto (born May 18, 1988) is a Japanese actor and singer. His major works include lead roles as Wataru Kurenai in Kamen Rider Kiva and Hiro in Koizora; and supporting roles as Satoru Okura in Atashinchi no Danshi, Ariake Yamato in Otomen, and Eiji Kikumaru in Tenimyu. He is currently starring as Mori Ranmaru in the drama, Gō ~Hime-tachi no Sengoku~.
In 2010, he was named one of the most promising actors and actresses, placing 7th in a poll conducted by Oricon. Through his role with Kamen Rider Kiva, he was also the lead vocalist of the J-Rock Band, TETRA-FANG. The lively and bright multi-talented Seto is nicknamed Setomaru and is a member of the acting group D-BOYS.
