Shinu Unmei ni Aru Akuyaku Reijou no Ani ni Tensei Shita node, Imouto o Sodatete Mirai o Kaetai to OmoimasuI Was Reincarnated As The Older Brother Of A Villainess Destined to Die; Shinu Unmei ni Aru Akuyaku Reijou no Ani ni Tensei Shita node, Imouto o Sodatete Mirai o Kaetai to Omoimasu: Sekai Saikyou wa Ore dakedo, Sekai Saikawa wa Imouto ni Chigainai; 死ぬ運命にある悪役令嬢の兄に転生したので、妹を育てて未来を変えたいと思います　～世界最強はオレだけど、世界最カワは妹に違いない～; I Was Reincarnated as the Older Brother of a Villainess Destined to Die, so I Want to Change the Future by Raising My Younger Sister with My Own Hands: I Am the Strongest in the World, but My Little Sister Must Be the Cutest in the World; Aku Bereinkarnasi sebagai Kakak dari Villainess yang Ditakdirkan Mati, Jadi Aku Ingin Mengubah Masa Depan dengan Membesarkan Adik Perempuanku Sendiri: Aku yang Terkuat di Dunia, Tapi Adikku Harus yang Tercantik di Dunia!

I, Zechs Levit y San Foranada, have a younger sister. Her name is Caroline, and she is a very lovely girl with beautiful blond hair and red eyes. Its no exaggeration to say that shes the cutest girl in the world, and her smile can be described as that of an angel. Despite the fact that I cant get enough of her cuteness, my little sister is doomed to die. This world is similar to a game in my previous life called Tzai no Isamu Sei-ki, in which Caroline appears in the game as a rivalA villainessof the main character, whos a Saint. And as a result, she dies brutally on every route. My beloved sister is going to die? I cant allow such an unreasonable future to happen! Thats why I decided to resist fate. I will raise my little sister in a pure and righteous manner, and I will forcefully overcome the numerous death flags. Believing that theres a bright future ahead for me and Caroline. This is the story of me, who became the strongest to protect my sister, Caroline, the cutest little sister in the world.