Undergrowth (AU)

When a young human girl named Frisk falls in a hole she discovers many underground towns, and a underground utopian kingdom nicknamed the "Underground". She travels and meets a skeleton named Sans who's chill and is very powerful, but his puns are annoying, his baby brother Papyrus who loves spaghetti, is very kind, but not bright at all, and a spider lady named Muffet who sells baked goods that are crazy expensive, but is very close friends with the skelebros. As she stays longer in the the underground, she starts to fall in love with Sans. For she has the determination to get back home.