An album containing several of the songs that Akiko Shikata made and sung for Ar tonelico Qoga: Knell of Ar Ciel, remixed to sound as if they were played from an orgel (music box). This also includes a original composition, Au GuMu, whose original hasn't been released officially yet; and an extended version of Rainbow Crayon from the Ar tonelico Qoga: Knell of Ar Ciel Original Soundtrack, which also doubles as the titular track of the album.