The Devil is DAD and I
Gamer gets isekaied into game world where he is treated like the demons' saint. He has to do the do with the demon king to restore the demon empire's power and they quickly fall in loves. The hero party is nice too!
I Reincarnated as the Little Sister of a Death Game's Murder Mastermind and Failed
Girl is reincarnated as the younger sister of a death game mastermind. In order to stay alive, she decides to act like a bit of a spaz so her brother won't get bored. He ends up developing a romantic interest in her.
Monster and Ghost
Buff delinquent x pretty boy ghost. One day a ghost attaches himself to the MC and starts building up his confidence. Still lots of backstory to cover, slow updates, but cute!
Oni no Hana Sagashi
Sigrid
MC used to be a royal lapdog but was beheaded as part of the emperor's schemes. She goes back in time and decides to live life according to her own wishes instead of as a "proper knight."
Mokrin
One day, invaders arrive on Mokrin's island, and one of them claims her as his wife! Several misunderstandings ensue, but they are quickly resolved and a cute romance unfolds.
Yoake no Uta
When Alto is a kid, he becomes attached to the nearest Kannagi and starts serving him even though everyone else in the village is afraid. Over time, the curse on the Kannagi appears to be lifting, and the two start to fall in love. At the same time, they try to uncover the secret of their island, why the Kannagi are left to die young, why the black sea is such a dangerous force, etc.
In the Doghouse
FL's family is terrible with money but one day the crown prince swoops in with an offer of marriage that can solve all her money problems. Only catch is that he's a hardcore M.
My Villain Fiancé is Interfering With My Flowery Path
FL reincarnates into villainess who is replaced by the true Saint, but it turns out both are Saints so the original bad ending doesn't come to pass. ML is a yandere and a bit stupid but still better than other leads out there.
I'm Yours, Blood and Soul