Her first album, Copy, was released on September 3, 2008. It was released in two different versions: a 12-track album and a 16-track album. The albums differ in that track 8 on the 12 regular edition album is the original version of “High Bash”, while the Yakenohara version appears on the extended edition, and the songs “Star Fruits Surf Rider”, “Rock’n Roll Is Dead”, and “Romantic Rope” are included in the extended version. Additionally, those who purchased the album through Tower Records also received an exclusive track, “Yakenohara Megamix”, while those who bought the album through HMV received the track “L0ne1yBoy L0ne1yGirl” as a bonus track.

Track 1 of the album, titled “Galaxy Boy”, was used as the ending song to Aichi Television’s programme Bonita!Bonita!! It was also used to promote the Dream car club of Tamoei Yakushiji. The album reached a peak daily position of number 31 on the Oricon chart, and a peak weekly position of number 48 and sold 3,163 copies. Mitsuki’s first major single was written as a tribute to China for the 2008 Olympics and released on March 5, 2008. She promoted it with a live performance in a Chinese nightclub, her first and to date only overseas show. Her second major (and fourth overall) single, “Robot Honey”, was released on October 29, 2008 and followed by “Valentine Step” and “Sayonara Technopolis” in February 2009. She released her seventh single, “Barbie Barbie” on May 20, and an EP exclusive to the Village Vanguard chain of stores, “Aira’s Science CD”, on June 17, 2009.

Aira released her second studio album, titled Plastic, on July 22, 2009 and her third album, ??? on November 17, 2010.

She released her final album with D-topia, I’ll Be Back on August 21, 2013 and went on a hiatus.

In 2015, Aira returned to music independent of a label, initially using the name “AIRA” and then settling on “アイラミツキ” in time for the release of her new song “LIGHTSAVER”.