Shinu Unmei ni Aru Akuyaku Reijou no Ani ni Tensei shita node, Imouto wo Sodatete Mirai wo Kaetai to Omoimasu: Sekai Saikyou wa Ore dakedo, Sekai Saikawa wa Imouto ni Chigainai

I am Zechs Levit y San Foranada, and I have a younger sister named Caroline. With her radiant blond hair and striking red eyes, she is undeniably the most adorable girl in the world, possessing a smile so pure it could only belong to an angel. I cherish her beyond measure, yet a devastating truth looms over our lives: my beloved sister is fated to die. This world mirrors a game from my previous life. Within that story, Caroline appears as the primary rival to the heroine—a villainess destined to oppose the Saint. Because of this role, every possible narrative route ends with her suffering a brutal and tragic death. The mere thought of losing her to such a cruel script is unbearable. I refuse to accept this unreasonable future. No matter what destiny has written for her, I will not stand by and watch my precious sister meet a violent end. Armed with the knowledge of the game's events and an unwavering resolve, I have chosen to defy fate itself. I will raise Caroline, protect her with everything I have, and forge a new path where her tragic ending never comes to pass.