aira yūki debuted with the release of her first single on april 25, 2007, "colorless wind" as the opening theme for the anime "sola". the single went on to enter the oricon charts eleven times with a peak ranking at 44th place. her second single was released on august 8, 2007 with the title track, being the second opening theme for the anime "idolmaster xenoglossia". the single charted four times with a peak ranking at number 49. yūki released her third single on february 6, 2008 as the ending theme of "true tears". like her second single, "sekai no namida" charted four times on the oricon chart with the peak ranking at number 48. on july 2, 2008, she released her first album, "reflection". the album only entered the chart once, ranking at number 148.