8utterfly

 is a singer-songwriter. Her former stage name was Koyumi.

Albums

 * [2011.03.02] Diary
 * [2011.11.16] Present
 * [2014.02.19] girl
 * [2015.01.28] CRY
 * [2016.04.06] Yamigirl (#ヤミギャル)
 * [2017.07.19] wordrobe

Digital Singles

 * [2008.08.28] SUNSHINE / Kanarazu (SUNSHINE/かならず) as Koyumi
 * [2008.12.09] Runaway / RUNAWAY (ラナウェイ/RUNAWAY) as Koyumi
 * [2009.05.04] Moshi / Beautiful World (もし/Beautiful World) as Koyumi