Originally sung by SeeU. UST by xAichan1991x. Instrumental and song by Hitman Bang. UTAU (program itself) by Ameya. Olika, Olika's design, Olika voiced by me. No OTO.INI yet. More info here: http://www.youtube.com/watch?v=ivH8GPenImE
http://www.nicovideo.jp/watch/sm18124619