Kamen no Hanayome

Alesia, born into a wealthy Greek family, lived modestly with her mother after being exiled by her grandfather 15 years earlier. She is unexpectedly called to meet him and told she must marry Sebastien Fiorukis, the eldest son of a rival Greek family. The two families have been in conflict for two generations, and Alesia is unaware of her grandfather's motives. Accepting the marriage would mean her ailing mother receives care, so she agrees. However, she has no knowledge of how her new fiancé will treat her.