"Tsubasa" is a song by Japanese pop singer Eir Aoi. It was released as thirteenth single digitally on July 17, 2016, and received a physical release on July 20, 2016. It reached number 9 on Oricon and number 5 on Japan Hot 100. It was used as the opening theme song for the second season of anime series The Heroic Legend of Arslan. The song was released before her indefinite hiatus in November 2016, although she would resume her activities in 2018.

Eir Aoi is a Japanese singer from Sapporo, Hokkaido, signed to Sacra Music. After being discovered through the Japanese video sharing website Niconico, Aoi made her major debut in 2011 with the release of her first single "Memoria", whose title track was used as the first ending theme to the 2011 anime television series Fate/Zero.