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I do NOT like this story, let's just be clear about this now, but it fits this criteria of this list. Girl dies in our world, but wakes up in another world where she's accused of being a "vampire". She's sold as a slave to an actual vampire. There's so much wrong with this relationship... but people seem to like it so here it is.
A mature woman dies via truck-kun, reincarnates, and finds love in her new fantasy world
young girl is reincarnated, and get's cheat abilities, but she didn't want them.
Our FL is reincarnated as the villainess of an otome game, and only regains her memories during the damnation event. She sets out to prevent herself from completely falling to ruin (or dying) by going after the "last boss", the demon king and proposing marriage.
YAOI!!! So, our characters meet after a japanese man is mysteriously transported to another world. Many people want him, since black hair is rare, and to propose in this world you must FIGHT or cut the other's hair.
Reverse isekai (yaoi). Samurai arrives in the present time and needs to find love to return
This is a fairly typical premise where someone is reincarnated into another world, there's also someone that was transported their. The reincarnated one enter's into a contract marriage/engagement with a duke to get rid of the transmigrated one.
FL transmigrates to anther world via portal and after a lot of things happen ends up married to not one, but TWO emperors (not at the same time), and eventually becomes empress.
The Maid and the Vampire