Ha... "foreigners get out of my game" is a pretty hot take for an MMO which constantly seems to be on the brink of losing English support entirely. Why not just have Japan-exclusive servers instead, and let everybody else flail around in a world where literally nothing that isn't endgame progression ever gets done, so Domain Invasion's streak resets every time the big dragon spawns, there's fighting in the streets of every nation in the past, and the astral candescence is gone forever the first time the server loses at Besieged?