I would of thought so, the saturn emulator ssf has been in development for a considerable time for example and i've seen many other emulators by japanese developers. So yeah plus looking at stats on some popular emulation sites, japan makes up 20% of the visitors
Heres and old topic discussing it to get some ideas on how they view it!
Site is all in Japanese, but has links to the latest stable and test builds. The test build has files updated as recently as Jan. 6th, 2018. The dev is pretty active on Twitter (again, all in Japanese). Profile suggests work on it has kinda slowed/stagnated though.