Jimi Hime to Kuro Neko No, Emmanna Konyaku Haki (M Novels) [Light Novel]

[Machine Translation] Seren, the eldest daughter of a ducal family, has been compared to her younger sister Marietta, who is considered the most beautiful woman in the world, and has been called a "plain princess" growing up. She hears her fiance, Prince Helios, saying that Marietta should be made a full princess. She hears her fiance, Prince Helios, saying that Marietta should become a full princess, and she decides to break off the engagement without causing any trouble. Seren, who has a secret (?) that Viol, the beautiful but unapproachable "Ice Sorcerer Commander," actually has a sweet tooth, is determined to make him happy and break off their engagement. Seren finds out that Viol, the beautiful but unapproachable "Commander of the Ice Magicians," actually likes sweets, and together with his messenger, Black Cat, they aim to break off their engagement...

絶世の美女と謳われる妹マリエッタと比較され、『地味姫』といわれて育った公爵家の長女セレン。彼女は、婚約者であるヘリオス王子たちが「マリエッタを正妃にすべき」と話しているのを聞いてしまう。「ヘリオス様に幸せになってもらうため、誰にも迷惑をかけずに婚約破棄しよう!」美しいが人を寄せ付けない『氷の魔術師団長』ヴィオルが実は甘いもの好きという秘密(?)を握ったセレンは、彼の使い魔の黒猫と一緒に、円満な婚約解消を目指すことに...。