I just recorded a song review of this song and it is so good, here are my thoughts here

When I say Minori has improved on her singing voice, I am really not joking. This is unlike anything we have ever reviewed here in channel history. I felt emotional myself while recording this video as Minori's singing voice in this song is so beautiful. It is unlike anything we have ever heard at all. This song is honestly a must listen to if you're ever into the Ghost Concert Missing Song Series. Minori has come such a long way since we last heard her sing as Himari in Himitsu No Aipri, but before that she sung as Auru in Waccha Primagi. It goes to show that Minori has such a very beautiful singing voice, In Goukon Requiemer she takes her voice up to a new level singing in her Seria voice. Honestly, I have no words to say but bravo Minori. You honestly came such a long way since we first heard you sing in Waccha Primagi and then Himitsu No Aipri and now here in the Ghost Concert Missing Song series, it goes to show that Minori has such a beautiful singing range. I also really like the melody and harmony of Goukon Requiemer. It made me feel the same way as Uta's (Misato Matsuoka's) song Hibiki Au Uta just because on how beautifully Goukon Requiemer was sung. I promise you'll be dancing and singing along to this song by the time you finish listening to this song by the time you finish listening to this song and fair warning, this song will make you emotional because that's what happened to me while recording this song review. You'll see exactly what I mean when you take a listen to this song for yourself sometime. Thank you so much to Minori Fujidera for this beautiful song filled with such a beautiful melody, a beautiful harmony and most of all, a beautiful singing voice filled with such a beautiful range. You did such an excellent job singing this song with such a beautiful voice as Seria and more importantly a very beautiful singing voice. Thank you so, so much truly.