Historical Japanese recs

"The Man in the Mirror"
not historical but just parallel worlds something

"Kouguu no Omega"
It's omegaverse but it is historical, the tropical kind of royalty tho

"Sabishigariya wa Yume o Miru"
Tbh, for my personal taste, didn't like this but it's made by Sakura Rico and it fits the criteria

"Itoshi no Kemukujara"
So much fur, makes me questions things about myself.

Tbh none of this is really the japanese kind of royal's....but they're in Japanese/mangas sooo I'll say it anyways

Why Japanese specifically?

Thanks

Because I have read many Korean and Chinese historical BL featuring kings or prince but haven't found Japanese ones . That's why .