Koushaku reijou no tashinami is about a girl who gets transported into the body of an otome game villainous. She gets dumped by a prince and after the initial "I need to survive" agenda, she starts managing her family's fief. The story involves a lot of politics and stuff like that and about 40 or so chapters in, there is a hint at a romance. Overall the story is very fun to read.
Chapters: 44 (ongoing)
This is an isekai, it's about Adelaide, a playful girl who ends up being a fake fiancée to the duke. It's a light hearted and fun story. It's cute and fluffy and I would definitely recommend it.
Chapters: 29 (ongoing)
Koushaku Reijou no Tashinami