Hi-Fi Days (Idolmaster) Wiki

An Idolmaster Cinderella Girls Starlight Stage original song performed by five members of the 18 person unit, L.M.B.G. It first debuted on March 31st, 2016. It was released for sale on June 22, 2016 and within its first week sold 89,000 copies and became the Idolmaster franchise's very first number one song.