At the border between the human world and the demon realm, a fortress found itself in an unexpected state of emergency.

"Everyone, arm yourselves! We don’t know what’s coming!"

The sky beyond the demon realm had split in two. A black energy was tearing through the red sky, absorbing it, and now, through the pitch-black darkness, a dazzling golden dawn was emerging.

Naturally, the frontline commanders, soldiers, and even the mages who had been called in for healing were thrown into panic. They had no idea what this light and darkness were.

"Commander! The sky!"

"What in the world is …