Eir Aoi, born in Sapporo, Hokkaido with blood type AB, is a female singer songwriter. 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 was soon gained attention when she was featured in Sony's published magazine, "Risu Ani! Vol.5". Eir was given the opportunity to debut with the TV anime "Fate / Zero" ending theme "MEMORIA" on October 2011.