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～

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~, Shinu Ummei Ni Aru Akuyaku Reijo No Ani Ni Tensei Shitanode, Imoto Wo Sodatete Mirai Wo Kaetai to Omoimasu Sekai Saikyo Ha Oredakedo, Sekai Saikawa Ha Imoto Ni Chigainai, しぬうんめいにあるあくやくれいじようのあににてんせいしたのでいもうとお

I—Zex—have a little sister named Caron, and she is the most precious person in my life. But if things continue as they are, she will meet a tragic end. Why? Because this world is identical to the RPG-style romance game I played in my previous life, and in every possible route, Caron cannot escape death. There’s no way I can let my beloved sister suffer such a cruel fate! That’s why I will fight destiny itself—no matter what it takes!