Summoned as an SSS-Rank Hero… with My Stepmom and Stepsisters?!

R-18 Novel ! I woke up in a fantasy world. Sounds normal, right? Classic isekai stuff. Except… I wasn’t just any hero. I was given an SSS-Rank ability, a cheat skill beyond imagination. The problem? I wasn’t summoned alone. My stepmother and my three stepsisters were dragged into this world with me… and now we’re all stuck in the same party. Monsters, magic, dungeons, kingdoms at war… I could handle all that. But surviving daily life with my forbidden family? That might be the real final boss.