Rinne no Hanayome: Shinimodotta Watashi ga Kishin no Saiai ni Naru made

In the imperial capital where ayakashi (supernatural beings) and humans coexist, a marriage proposal arrives one day for Mao, a young lady from a fallen noble family. The offer comes from the prestigious Tenma family—renowned exorcists.“Why would someone offer such a wonderful match to someone like me…?”Though surprised, Mao accepts the proposal for the sake of her family and goes to marry into the Tenma household.However, what awaits her is a life of mistreatment.Labeled a “useless bride” by her husband and in-laws, Mao endures the harsh days while trying her best to repay the favor of the arranged marriage.But behind this proposal lies a deeper, more sinister intention harbored by the Tenma family...

https://www.cmoa.jp/title/320549/