Of the talent in the industry at the moment the following girls standout for me:
Kurea Hasumi
This girl is a standout for her ass alone. Not the best looking girl in JAV but enthusiastic and very kinky. Her videos are a must just based on what she has up back.
Yuki Jin
Agree with the previous post. Yuki Jin`s ass is insane. Her covers alone are almost too much.
Kana Yume
My favourite girl in the industry for lots of reasons. She seems to really enjoy her scences, in particular, being hammered from behind. I`d love to have the chance myself.
Asahi Mizuno
Another favourite at the moment. Beautiful girl with great atmosphere. With a little more meat than a lot of other girls she`s another stand out for me.
However, for me, the best ass (sadly no longer in the industry) was:
Nana Ogura
Great looking girl with a natural body. Also carrying a bit more at the back than many girls. She seemed to really enjoy her scences and being pounded from behind. I read some place that she moved to Italy after retiring. She certainly seemed to spend time there while her blog was still active. Hope she`s being seen to on a regular basis by an Italian stallion. Thanks for the memories!