Well there is nothing that will do only Japanese but you can certainly easily remove all non Latin-1 characters. I would fold some Unicode characters first so that variations of dashes, etc. are not removed.

The action is called: Remove non Latin-1 Characters from Fields

It can be run three ways: When run from the multi field editor, you specify the fields to be modified. When run from a function button, only the associated field is modified. When directly run, Album Artist, Artist and Title are modified.

I've just reread your post and I think this may not have exactly the desired effect. It will not remove the '=' character. It might be a better approach to look for ' = ' and remove it any everything after from the fields. I'm taking your post literally and assuming the the sequence is space = space. If it's not, let me know. I've also included an action named: Truncate Field after Space Equal Space. This second action has the same run modes.

Both actions are contained in the zip file at https://2manyrobots.com/actions/Various-Truncate.zip

Thanks "Truncate Field after Space Equal Space" worked great. I forgot the Album also is translated sometimes too, so I edited you action. Thank you so much.

Roger that. Makes sense. For sporadic use I think the manual Action approach is most likely. Options are always helpful though. Appreciate the support.