skin 1 : Romi Skin *LB or group gift
Romi has just put a new LB skin. I'm gonna put its picture soon here! 
Skin 2 : Yome Shoujo *free gift
There are 2 versions of skins. Really cute!!!
Skin 3 : Mynerva *April limited time -50%
I don't know if it's still available, but Mynerva seems to be like a new shop and there are more skins that make you feel like buying them all:))