I loved everything from the latest album
you can start with E.G Time. It's my favourite one. I also liked the PVs. My favourite songs are the more "cool" ones haha (Rydeen, Move it, Rock'n'roll widow, ASAP) but I guess Japanese girls really loved "Follow me" "Gomenasai no kissing you" and "Mr.Snowman". Until now they "only" released three albums I recommend listening to all of them but I was really surprised and happy that E.G Time was THAT good. :-)