 If you liked
Akuyaku Reijou nanode Last Boss wo Kattemimashita
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 ...then you might like
Yarinaoshi Reijou wa Ryuutei Heika wo Kouryakuchuu
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Both main character girls are reborn in the world and knows what happens in the future. They are forced to marry a man who will ruin them, so the girls ran away to find another man to marry so that they can escape. Turn out the guys they both chose are a "evil" king. They fall in love with each other in both animes and protect them.
There is also spiritual being that both girl main character can see and befriends who are associtaed with the king
Similar plot. You'll love one another.