@onefive (ワンファイブ) is a J-pop girl group formed in 2019. They debuted with their digital single Pinky Promise, which was released on October 20, 2019. All four of the members are Sakura Gakuin graduates and had their debut during their last year of Sakura Gakuin, shortly after graduating releasing Mada Minu Sekai (まだ見ぬ世界) and Shizuku (雫). Their first performance was in 2019 during the Sakura Gakuin Festival. Pinky Promise was performed the day of their debut at the festival.