I Was Reincarnated As The Older Brother Of A Villainess Destined to Die

I—Zechs—have a little sister. Her name is Caron, and she’s so precious to me I couldn’t love her more.
But if things continue as they are, she’s doomed to die a tragic death.
Why? Because this world is exactly the same as the RPG-style romance game I played obsessively in my past life.
And in every route, no matter what, Caron’s fate ends in death.
There’s no way I can let my beloved little sister meet such a cruel end!
That’s why—I’ll fight back against fate with everything I’ve got!