Thank you for the post. Yes, I have found more documentation and Akamatsu is the correct spelling, thank you for pointing that out.
I have uncovered more information - she was born in Okayama-ken, at least that's what she listed on her marriage certificate to my grandfather (which I only recently found). I know that was before the war, and after the war they moved to Osaka.
I haven't found anything with a city or village name on it unfortunately.
Thanks again for your input. Would appreciate if you know anything more. The family register is something I would love to be able to obtain, but short of going to every village and city in Okayama, I'm not sure how easy that would be to obtain.