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.
[7] Aira's musical style has been compared to the popular Yasutaka Nakata-produced acts Capsule and Perfume.
Aira has stated that she is a fan of Nakata's work and cites the Pizzicato Five, Kahimi Karie, Yuki, Justice, Cornelius, and Daft Punk as influences on her MySpace page,[8][non-primary source needed] while she has covered songs by Cornelius, Kenji Ozawa, Kahimi Karie, Genki Rockets, Cascada, Lenny Kravitz, and her labelmate Saori@destiny.
Aira's music usually carries themes of science fiction or pop culture with ambient sound effects, heavy use of vocoder and lyrics exploring concepts such as space, robots and technology.
[9] Aira has experimented with different genres of music; much of Copy had a dance sound while "Valentine Step" has strong Latin influences and "Sayonara Technopolis" was marketed as "electro meets big beat".
She has professed to being a fan of video games such as Pokémon and has stated in interviews that she is inspired by science fiction and technology.
The CD also contains a cover of Kahimi Karie's "Mike Alway's Diary" and a remix by I Am Robot and Proud, as well as versions of "Science Music" and "Senjō no Merry Christmas" sans theremin.