tsubasa
Moderator
The first one because it feels or sounded negative for some reason...It (the word that) is used as a conjunction, so I was equally as confused as grunty. When people automatically think of the word "that" as a way to point someone/something out (accusingly/somewhat derogatorily), ngl I think they need to go on social media less. Or did you mean to rewrite the sentence completely? Something along the lines of "The concert will instead feature former Kalafina/H-el-ical member, Hikaru as a guest"?