"When I Tried to Prevent a Yandere, My Brother-in-Law Might Have Awakened to a Peculiar Fetish.《Serialized Version》"

I seem to have been reincarnated into a yandere otome game as Meriathe Leonheit. Huh? My step-brother is a potential yandere? And on top of that, my death—as his beloved older step-sister—is what triggers it?! ......In order to prevent him from becoming a yandere, I'd like to start by making him hate me. ///This is the serialized version of a short story with the same title. Episode 1 is currently the same as the short story version./// I apologize, but this story is not compatible with vertical text formatting (--;) Thank you for your understanding.