I've made native Japanese speakers list before.
https://bitcointalksearch.org/topic/verified-japanese-translators-list-5130764
If you need good translation it may be good to ask them(though you can't get any reply because most of them are not active now.).
His service thread: https://bitcointalksearch.org/topic/korean-translationcommunity-manager-check-the-list-of-my-40-ico-projects-2880970
If his translation are posted on Japanese board it'll be reported as "machine translation"
I am willing to translate your article perfectly within short period of time.I will message you on Telegram.
My Telegram is +2348088759163.
If you are not native Japanese you can't translate his material "perfectly".
Modalities of cooperation and project details are discussed by e-mail ([email protected])