FRAGMENT is the fourth studio album released by Aoi Eir, and her first album since switching to Sacra Music. It was released in five versions: a limited CD+Blu-ray+Photobook+T-shirt+Goods perfect Fanclub edition, a limited CD+Blu-ray+Photobook+T-shirt perfect edition, a limited CD+Blu-ray+Photobook edition (Type A), a limited CD+DVD+Photobook edition (Type B), and a regular CD only edition. Pre-ordered first press editions come with a poster as a gift. "Cynthia no Hikari RE BLUE LIVE ver." was included on the Digital "Special Edition" as a bonus track. The album includes three songs from her latest singles: "Yakusoku", "Ryuusei" and "Iris", along with eight new compositions. The track "UNLIMITED" was released on March 18th 2019, as a digital pre-release and was used as the opening theme song for the PC/PS4 VR gameTokyo Chronos.