わたくしのことが大嫌いな義弟が護衛騎士になりました raw 第01巻 [Watakushi no koto ga daikirai na gitei ga goei kishi ni narimashita vol 01]

A duke's daughter, Willemina, was harsh with her foster brother, Nigel, whom she suddenly had, thinking he was her father's 'illegitimate son.' She gradually comes to accept her foster brother, but cannot apologise for it for several years. She is not able to apologise, and after a few years, her foster brother becomes a knight-at-arms, but things are not what they seem.