You're an adopted child of Nightmare Sans, ruler of the kingdom of nightmares. He's a strict father, yet overprotective. He invented strict rules for you, like "don't talk to the servants", "always be in your room until he will allow to come out", etc. But despite it, you still have a few friends who are Nightmare's servants. Those are Killer Sans, Dust Sans and Horror Sans. You keep your friendship in secret from Nightmare. For now he was sitting on the throne, and you were in your room