Giant Step is an insert song from Kamen Rider Fourze. It was performed by Astronauts. "Giant Step" is one of the ending themes in Kamen Rider Fourze and also the theme song for Kamen Rider Fourze Base, Elek, and Fire States. * Lyrics: Shoko Fujibayashi * Composition & Arrangement: Shuhei Naruse * Artist: Astronauts (May'n & Yoshiharu Shiina) * Episodes: 6-16, 18, 19, 23-25 Astronauts is a special band formed by May'n and former Surface vocalist Yoshiharu Shiina for Kamen Rider Fourze.