GIRLFRIEND (ガールフレンド ) is an all-female pop-rock band formed in 2015 at Caless, Osaka’s vocal and dance school. The band started out as a trio with Mirei, Sakika, Mina until the addition of Nagisa. They performed at various events in 2015. Their first one-man live was held in March of 2016 in Osaka. Their first indies album “Hello” was released on August 3.

They made their major debut under Avex Trax on November 23 with the single “15/Hide and Seek and the single was also used for the ending theme to anime “Twin Star Exorcist. ” Their song "Sky & Blue" was also used as the opening for Black Clover Opening 8.