Yep, more Japanese games 😆
Anyway, that crossover thing isn't anything new. The "Tales of..." series from Bandai Namco does a similar thing with some sort of half baked, alternate universe bullshit just so they can have characters from other Tales games appear in cameo roles, usually as high level optional bosses to fight. I also heard read somewhere the Jecht was meant to be a recurring character in Final Fantasy, but was only ever canonised in the world of FFX. I have NO idea how they were going to make that work.