Watakushi No Koto Ga Daikiraina Gitei Ga Goei Kishi Ni Narimashita Jitsuha Dekiai Sareteita Tte Hontona No!? (Kadokawa Beans Bunko)

[Machine Translation] Willemina, a duchess, is a little bitter about her suddenly born brother-in-law, Nigel, whom she considers to be her father's "wrongful son". She gradually came to accept him as her brother-in-law, but she could not apologize for it for several years. When her brother-in-law became a knight-errant, she asked him, "Is that it? I thought it was a loving scolding. "It wasn't that he hated me, but... "Sister, you're too cute!" Isn't the grown-up brother-in-law too close? And what's more, the brother-in-law's origins seem to have something to do with the royal family...?

公爵令嬢、ウィレミナは突然できた義弟・ナイジェルを父の『不義の子』だと思ってきつく当たっていた。次第に義弟を認めていくものの、謝れず数年。義弟が護衛騎士になることになって―「あれがですか?愛あるお叱りにしか思えませんでしたが」「なんですって!」憎まれていたわけではなかったけれど...「姉様、可愛らしすぎます」成長した義弟の距離が近すぎでは!?しかも義弟の出自には、王家と関係があるようで―?