[Machine Translation] This single, the third single, is the opening theme for "Gurren Lagann", the first robot anime in 11 years to be created by GAINAX, the anime production company that created the "Neon Genesis Evangelion" anime that has dominated the world. The album also includes "happily ever after" (insert song for "Gurren Lagann"), "Mitsubachi no sasayaki" (theme song for "Animal Star Birth") and "Sorairo days -Instrumental-". The DVD includes the music video for "Sorairo Days".