FLOW will release a new single titled "Niji no Sora" on August 12th. 

The single's title track has been chosen as the new ending theme for TV Tokyo's anime 'NARUTO Shippuden'. In the past, FLOW has provided "GO!!!", "Re:member", "SUMMER FREAK", and "Sign" as theme songs for the anime, making this their 5th tie-up. The upcoming single will be released in 3 different types: Limited Edition, Regular Edition, and Anime Edition. 

"Niji no Sora" will be used as the ending theme for 'NARUTO Shippuden' beginning with its July 2nd episode. 

Source & Image: natalie