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Misskey instance?
(fedia.io)
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For Misskey-powered instances, there's also Nijimiss.moe from the bigger ones I know about. It appears to either house or federate a lot of Japanese users too, from what I could observe. And dunno your Mbin instance, but on mine, I can follow Misskey.io and Nijimiss.moe users just fine, just taking a little while to populate the /all page (but surely happening since Japanese folks seem to interact between one another a lot), and at worse on federation to Mbin with some formatting issues for posts since Misskey feels a bit like its own thing.
But alas, on the flagship (?) instance, I know a guy that was able to create an account when he/she lived for a while in Japan, and when the person went to another country, access to the site remained.
Thanks, I guess I have to find some Japanese accounts to follow and see how mbin takes care of it. Will also try to open an account while over there to see if it still works when back home