 Their single, "7 -seven-", was a collaboration with the band Granrodeo and was featured as the ending theme to the anime "The Seven Deadly Sins".Flow released their second anime best album compilation "Flow Anime Best Kiwami" on February 25, 2015.Flow's first-ever world tour, "Flow World Tour 2015 Kiwami", will see them performing five times in Japan and fourteen times in seven other countries.