Kai and Frisk are humans, the 9th and 10th fallen humans of the underground to be exact. Their journey is one where friendships change, enemies are made (and befriended), and the very nature of the universe shifts. If they've learned one thing throughout this whole ordeal, is that nothing they do really matters, so might well have fun while they do it, right? Right? To think this all started because of two kids with abandonment issues.