In order, my preference is :-
Aragaki Yui
Horikita Maki
Nagasawa Masami
Sawagiri Erika
Most Japanese actresses are very beautiful and there are too many to list, but Aragaki Yui hits the spot for me.
I have now watched this drama all the way through and I think it is absolutely superb, I loved it, and of course it had Gaki as a co star and for me that made it ten times better.
That was long and very interesting, I'm not qualified to give an opinion as I am English, but as I like many things about the Japanese culture and find Japan a fascinating country I would like to know how the Japanese view people from other cultures and countrie