>>8715217I searched around a bit. The one in your pic doesn’t appear to be Japanese exclusive as it’s sold more often on eBay rather than Japanese sites. What you should do is create a saved search on eBay that will notify you when a listing pops up.
The other Japanese Angel plushes don’t show up often either. I’ve only found two that have sold recently on different sites. What you’ll have to do is bookmark your search on a auction/resale site like Mercari, Yahoo auctions, Fril etc. with the phrase わんわん物語 エンジェル ぬいぐるみ (doggy story angel plush) and check back daily to see if it shows up.
Be patient and good luck!