TETRA-FANG is a Japanese rock band considered a "limited rock unit" and was created for musical tie-ins with the tokusatsu program Kamen Rider Kiva. History TETRA-FANG was formed in 2008 to serve as a promotional band for Kamen Rider Kiva. The group composes music in a rock style and features a rotating line-up of members for each of their singles. Koji Seto who portrays Wataru Kurenai, the lead character in Kamen Rider Kiva, serves as KOJI, the lead vocalist of the group for the single releases of Destiny's Play and Individual-System.

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