"Anniversary!!" is a song recorded and performed by Japanese collective unit E-girls. It first appeared on their greatest hits album E.G. Smile: E-girls Best (2015), and subsequently served as the single of their fourth studio record E.G. Crazy (2017). The track was released on May 20, 2015 through Rhythm Zone and Avex Music Creative Inc. in three physical formats—two CD's and a DVD bundle—and for digital consumption. The song was written by Hana Utsugi, composed by Sky Beatz, Fast Lane and Lisa Desmond, and produced by Exile's Hiro. "Anniversary!!" is their first single released in 2015 to only feature selective members in the line-up.