GUMI - Songs. 【GUMI】モザイクロール【オリジナル曲PV付】 Mozaiku Rooru - Mosaic Roll - Vocaloid Original Songs - Doujin. Tags search for "GUMI" - Niconico. [GUMI×Len×Gakupo] DeadLine Circus [Original] - Niconico. Deddo Rain Saakasu - Dead Line Circus - Vocaloid Original Songs - Doujin.