The heroine is my step-sister!

Kon'nichiwa, my name is Tanaka Azumi. I'm a normal office worker who died in a car accident. But instead of dying, I reincarnated into my fav Otome Game. And I was reborn as the Villainess of the game a.k.a the Heroines step-sis! The worst part is, that she has a whole harem!? I have to make sure I don't trigger them or it's off with my head!