Also, if we’re talking about a Web page the developer(s) of the page need to be using the language attribute correctly. Just having the page being written or displayed in the Japanese language won’t switch the synth language to Japanese if English is still being used as the default or primary language.

Of course, if the synth has been set to Japanese and if it’s still not speaking correctly then this is a bit outside of my wheelhouse.

David Goldfield,

Blindness Assistive Technology Specialist

NVDA Certified Expert

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www.DavidGoldfield.org

Do you have automatic language switching turned on in Speech settings?

Also, and this is not meant as snarky, are you certain you are using Espeak as your synth?  I'd also suggest, once you're certain that automatic language switching is turned on in NVDA, that you give the Microsoft OneCore Japanese a try, if for no other reason than testing.  It does support text to speech.
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Brian - Windows 10, 64-Bit, Version 21H2, Build 19044  

The difference between a top-flight creative man and the hack is his ability to express powerful meanings indirectly.

         ~ Vance Packard