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

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!