[@Expllo] If you go with the immigrant angle, all you really need to know is that Hino is essentially fantasy-Japan, down to the wire. Since your character would've been raised and gotten his grimoire in the Clover Kingdom it wouldn't be relevant, but in Hino the natives also have Scrolls instead of Grimoires.

For the purpose of the RP, I don't really know if it'll come up in the plot much outside of the presence of NPCs, but I had been considering that the two countries had begun to interact more in the 150 years after canon. Developments in seafaring, trade agreements, etc, and now along the coastline in the bigger cities of the Noble Realm, there will sometimes be a "Hino Street," "Hino Town," or something along those lines where immigrants have begun to congregate. Of course, that doesn't stop them going anywhere else in the Realm they'd like or marrying into Clover families. So those who want to take some kind of influence from that for their characters, feel free!