SPIRAL TRILOGY, featuring KAITO, is a mini album by Ebot. It was released by KarenT for KAITO's Birthday 2011. It consists of 3 tracks, which are traditional japanese songs.
In November 19, 2011, 2 more CD works of the series, titled 螺旋 -RASEN- and SPIRAL TRILOGY The Art Works, were released for THE VOC@LOiD M@STER 18. The CDs include the remasters of the previously featured 3 tracks, together with the instrumental versions of the songs and also features a bonus track, sung by Mew. A crossfade of the CDs could be heard here.