What’s the best AI chat app where you can choose how the story unfolds?

I’m looking for an ai chat choose story experience where the conversation feels like part of a branching narrative. I want to be able to make decisions in chat that actually change the storyline, not just get random responses. Ideally, it should allow me to pick genres, set scenarios, and develop ongoing character relationships. Does anyone know of an app that offers that level of interactive storytelling?