This single features the A-side "なないろ" and the B-side "Sleeping Rainbow", both used as theme songs for the anime series *Vivy: Fluorite Eye's Song*.
- The single was released on May 18, 2021, by TOY’S FACTORY.
- "なないろ" is the band's first single release since "Shiver" in 2020.
- The single reached number 5 on the Oricon Weekly Singles Chart.
BUMP OF CHICKEN are a rock band formed in Tokyo in 1994, best known for their narrative lyricism and blend of alternative, pop, and stadium rock. They were at a mid-career stage, having recently released their eighth album *Butterflies* and embarking on their tour, when "なないろ" was released.
Tracklist
