I visited ANA on my trip to Tokyo this Spring. The airline regards their pilots very highly, and although the history is to not hire women, the airline is changing as women take a more prominent role in the World. I don't think they ever intentionally not hired someone because they were female, but more because their experience was less. So don't let yourself not apply just because you're a female.
Also, the COO mentioned that English, was still a very foreign language to them. They do speak english, but it's a bit broken. I work with Tokai students and while they can converse, some words just escape them. I would highly recommend learning japanese. You don't need it, but it will make your time there a lot easier. ANA also is running a program to increase english fluency with their aircrews, but when you've never heard of the alphabet or syllables, it gets a bit harder.