When Filia, the daughter of a duke, met her brother-in-law Luca when she was 10 years old, she remembered that she was the villain of an otome game. 11 years left until the game starts. Let's avoid the death route...! She tried with great enthusiasm, but all failed. As the game states, Filia is a fiancée candidate for the crown prince, and is disliked by her brother-in-law, Luca. The heroine also appears, and Filia is on the brink. She tries to avoid her ruin flag by marrying a mob knight, but she says, ``She can't let you go.'' Appear!? 公爵令嬢・フィリアは10歳の時に義弟のルカと出会い、 自分が乙女ゲームの悪役であることを思い出す。 絶対に死亡ルートを回避してみせる…！と意気込むけど ゲームの設定どおり、フィリアは王太子の婚約者候補となっていて 義弟のルカには嫌われてるみたい… だけど、本当は… 麗しのヤンデレ義弟に 身も心も奪われる濃密ラブ!