Shinigami Koujo no Kekkon

[MangaDex]

 

[Haydrion101]

This is such a good manga, I wish there was more.

 

[isokania4ever]

made a whole account to say I’m so happy this updated omgomgomgomg

 

[Ovnidemon]

This manga should have the villainess tag. True, it's not the classical villainess but I think we can consider the heroine as being a villainess since she is an assassin, it involves romance and intrigue among nobles.