The heroine travels through a different world novel just to save the villain. The heroine is a funny woman. She has brains but not a virgin. The heroine is in the first person. Is that all there is to it? I'm lying to you, but it's actually a harem story with a heroine, and everyone has to fall in love with the heroine.
It's a romantic, enjoyable piece of writing that won't leave readers feeling offended.