As far as I see it on the website, it looks fairly accessible. They have wheelchair rental service, too.
https://kagoshima-barrierfree.com/barrier-furee/%E7%9F%A5%E8%A6%A7%E7%89%B9%E6%94%BB%E5%B9%B3%E5%92%8C%E4%BC%9A%E9%A4%A8/

Hi Teresia!

We have mailed you upon your application to the one you registered on the form. We have just sent it to you once again adding one other address we have. If this mail has arrived, please revert to us. Once we talked with the delivery and pickup details with the hotel, we will let you know the further process. Thank you.

😀

Hi Theresia,

Sorry for the inconvenience. It is our issue and we have just fixed it. You can send us a mail now at info@ohayotravel.com.

Please send us mail at info@ohayotravel.com We will be responding to you on that.