Finding a japanese studio willing to join Xbox will be very hard. I think it will be better if they make a new studio based in Japan.
Just say that you're looking for developers that want to make games aimed more at western gamers(Resident Evil, DMC, Monster Hunter).
I'm sure there're alot of devs in japan that arent interested in making games only with anime aesthetics.
Dude MS building a new team in Japan would be even harder, they also wouldn’t do it unless they can find an experienced studio head that has connections and can recruit talent.