I will be the dissenting voice.
Miyuki is not best girl.
She's creepy and violent and possesively controlling.
She ranks on par with Eri.
Reiko is vapid and uninteresting.
Karen is cute, and at one point was a contender, her naivety holds her back too much.
While I'll admit Aika is beyond stupid, she has always been cute, but...
HAKUA, BEST GIRL, ALWAYS!
FIGHT ME!