The song was first uploaded on August 11, 2008; a song entitled "Prisoner" with Kagamine Rin as the main vocal. It did not receive much attention, however, three months after the "original" version was uploaded to Niconico, Len's version, along with a collab PV from Piapro featuring Nazekorewo-P, Madoromi, Carl, and more, was uploaded. Main article: Prisoner Series