TETRA-FANG is a Japanese pop-rock band considered a "limited rock unit" and was formed to perform songs on the soundtrack for the 2008 Kamen Rider Series Kamen Rider Kiva.

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." "Destiny's Play" was released on April 23, 2008, and came with a DVD containing a music video for the song. The single ranked 25th on the Japanese Oricon Weekly Single's Charts in its first week. "Individual-System" was released on June 25, 2008, and was be the second ending theme for Kamen Rider Kiva.

An arrangement of "Individual-System" was released one month after the initial release of the original version on July 30, 2008, and featured Keisuke Kato on vocals, known as "Fight for Justice ~Individual-System NAGO ver.~" Also, on August 6, 2008, a mini-album was released, SUPERNOVA, after the song of the same name used as Emperor Form's theme song. It also features character songs for Garulu, Basshaa, and Dogga, two of which have been featured as the ending theme in the series.

TETRA FANG - Supernova

TETRA FANG - Roots of the King

TETRA FANG - Destiny's Play

TETRA FANG - Individual System