The demon princess awakens. The day she awakened is also the day of her relevance in the main story.
"Atlas, have you seen this woman from before when you are still part of the demon army and rule a dungeon?"
"No Master. Even though she is called the demon princess, it seems she is not someone famous or well known even to the lesser demons, so even if you ask me, I don't think I can answer your question about her."
The demon princess seems to catch up on what we are talking about and she slowly goes out from the coffin completely. She wobbles a bit, maybe an aftereffect of being asleep for how long it has been.
"What do you mean I am not famous in the demon realm? I am the one and only demon princess. There is no way no one knows about me!"