影炎≒Variation (Kagerou≒Variation)

Background
Yairi's most notable work.

This song was commissioned for the IA THE WORLD ~Kage~ album. It is also featured on VOCA NICO☆PARTY as well as in Exchange Variation, Yairi's 1st compilation album; alongside niki/cillia's cover. This song will be featured in the PS VITA game IA/VT -COLORFUL-.

This song entered the Hall of Fame.