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～

あらすじ

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!