Biography
iyuna is a musical duo consisting of ミウラハルミ (Harumi Miura) and イワサキヨシヒロ (Yoshihiro Iwasaki). They are member of "iyunaline" in 2006 which iyuna collaborates with vocalists before iyunaline changed it's named in January 2009 as solfa.
Biography text from Last.fm, available under CC BY-SA.