My top would be :
10 - Suzu Honjo, she's done a lot of scenes, she's natural, very pretty and has distinguished herself in different types of scenes.
9 - Suzume Mino, like Suzu, she did a lot of scenes, but her acting is better.
8- Sumire Mizukawa, still active, a huge number of videos, even though there are things she hasn't done yet. The best is yet to come
7 - Maria Nagai, I used to really like, and I still appreciate her acting, but she's overdone the surgery and I think that's a shame.
6 - Michiru Kujo, She left the industry far, far too early. She was seen almost exclusively in scenes in which she was dominated, when she would have done just as well in other roles.
5 - Rei Kamiki, she's already played different kinds of scenes, she started not long ago, she's very promising.
4 - Ai Sayama, for her versatility, she tested different scenes, from sensual scenes to hardcore gangbangs.
3 - Meguri, I like her quirky side, likewise, she can play different types of scenes.
2 - Ayane Sezaki, I find her very pretty, she's less versatile than the others, but she's already dared things like IR, which is a good point, but she's more discreet than the others.
Special mentions:
- Ren Usui, Like most, very pretty actress, many scenes to her credit, very open-minded, even far too much so, and that's the problem, I think she might not have shot some scenes... lol.
- Julia, I'm not a big fan of this MILF, but I have to admit her acting is pretty good and has quite a few interesting scenes.
- Aya Shiomi, Very pretty, lots of scenes but almost all bondage.
1 - Mei Matsumoto, she left the industry too early, she has many interesting scenes like her impressive two hours gangbang.