^^While I very strongly recommend Raven... it's entirely straight, if anything at all. Maybe if you have some incredibly strong, prescription-only yuri goggles you can see something I don't, but I would really not go into it with that kind of expectation. There is a cute friendship but zero romantic tension or anything at all there, IMO.
Raven elaboration, details about the vibe of the show but no major spoilers:
I wouldn't even call it straight, really, at least as far as was adapted. The Emperor is fond of Jusetsu but she has agency and firmly rebuffs his advances without it just being a tsundere routine, which is refreshing to see in an anime. There are indications that she will probably grow to like him later in the story, but in what was adapted thus far it was less a romance of any kind and more a tale of two people isolated by their positions becoming genuine friends.