Eir Aoi —born as Aoi Eiru (藍井 エイル) on November 30, 1988, in Sapporo, Hokkaido, Japan— is a pop singer signed to Sacra Music. Aoi began her singing career in a band she formed in high school. She made her major debut in 2011 with the release of her first single “Memoria”.

Aoi’s music has been featured in anime series such as “Fate/Zero”, “Sword Art Online”, “Kill Ia Kill” and “The Heroic Legend of Arslan”.