The reincarnated heroine's mission is to protect the villainous older sister!

I was reborn as the heroine of an otome game. However, the capture targets and scenario are a brutal, sadistic mess notorious for being "insane" in my past life. On top of that, my sister, who is the heroine's rival, dies in every route. I won't allow such a thing—me, Adelaid, a fan from my past life and now just a devoted sister complex in this life, will prevent it! Of course I love my big sister! Come at me, you heroes! ——Or so it should have been, but things took unexpected turns...? Loud-mouthed, clumsy, muscle-brained, and by everyone's admission, an embarrassingly obsessed sister complex no matter where you take her. This is a story of such a disappointing protagonist fighting against destiny while going through all sorts of hardships. ※Currently being posted on other sites.