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

Zechs has a younger sister. Her name is Caron, and he loves her very much. However, if things continue as they are, she will die an untimely death. This world is the same as the RPG romance game he played in his previous life where Caron is destined to die in every route. There was no way Zechs would allow his beloved sister to die so cruelly - that's why he'll resist fate to the bitter end!