Kizumo no Reijou wa Gitei no Ai ni Donkan desu!?

Ten years ago, Maribelle suffered a severe chest wound while protecting her young brother-in-law, Leon. However, in aristocratic society, women with physical scars are despised and ridiculed. For this reason, Maribelle left the ducal family she grew up in, but even at a local aristocratic mansion where she worked as a servant, she was called a marred woman and spent her days being mistreated by the countess and the servants. Even now, she is betrayed by the only kind person in her life, and when he attempts to assault her, she is rescued by a heroic knight in black who has stopped by town on his triumphal return. He, whom Maribelle did not recognize, tells her he has come for her. (Source: MangaPlaza)