Akuyaku Reijou no Keibo wa Ni ga Omoi no de, Zenryoku de Shiawase Route Mezashimasu 1 (Young Jump Comics)

[Machine Translation] Countess Barbara Seitel, who loves handsome men, was a university student in Japan in her previous life. After an accidental reincarnation into a book she loves, she is now 18 years old and has an arranged marriage with.......! A villainous duke who will (supposedly) plunge this country into the depths of terror in the future! If I fall in love with him, it will be the end of me and my family. That's what I think in my head, but the Duke is so refreshingly handsome that my heart is aching, and I can't stop my feelings from rising.... Now that it's come to this, I have no choice but to go all out for happiness with him and his future stepdaughter, who will be working together with him to do evil...? I'll avoid a bad ending! I'll avoid the bad endings!

イケメン好きの伯爵令嬢バルバラ・ザイテルは前世は日本の大学生。不慮の事故により愛読書の中に転生して、この度めでたく18歳でお見合いをしてみたら、相手はなんと…！　この国を将来恐怖のどん底に陥れる（はずの）極悪公爵!?彼を好きになったら、私も家族も身の破滅──。頭ではそう思うのに、公爵のあまりの爽やかイケメンぶりに、心はキュンキュン、高まる気持ちを止められない…。もうこうなったら、彼と、彼と一緒に悪事を働く彼の連れ子である未来の悪役令嬢（仮）もまとめて、全力で幸せルートを目指すしかないの──!?「バッドエンドなんて回避してみせます!!」