For the one who watches VANGUARD:
This is ULTRA RARE Seiyūs:
-Suiko(Aimi Terakawa aka Kasumi seiyū)
-Kourin(Mimori Suzuko aka Umi seiyū love live lol)
-Rekka(yoshino nanjō aka eli ayase love live)
So if u hear them sing it will sound like there is umi and eli but aimi is with her different voice