Oh well Ranka's Aimo always sounds the same except maybe for Aimo OC anyway
The two CDs have total 32 songs but 21 of them starred Megumi
They really should change the name of OST3 to
Nakajima Megumi and friends 
What's worse, only 6 of those 21 songs are her original songs (13 if including Aimo)
She is indeed
the queen of cover 