Well, this was... unexpected. We don´t even know their names, they just sing the opening XD.

I still prefer this over Haruka and her almost grotesque breasts

It's just funny for now. XD

We do know their names, actually.

Rouge (Tomatsu Haruka)
Violette (Hayami Saori)
Citron (Nakajima Megumi)

They sing the OP as the group "Eclipse"

Woot, some Ranka kira~ in the house!