Eir Aoi (藍井エイル; born November 30, 1988 in Sapporo, Hokkaido) is a Japanese female singer-songwriter. She has recorded songs for hit television shows such as Sword Art Online and Arslan Senki. She loved to sing from a young age and was responsible for the vocals for her high school band. But after high school, she had to temporarily abandon the band's activity and only resumed singing career as a hobby. However, Eir's talent soon gained attention when she was featured in Sony's published magazine, "Risu Ani! Vol.