Guest was a hero who fought bravely against the Demon King. However, as the Demon King died after being struck in his weak point, he spat poison onto Guest's body. Guest died on the spot, but Babil, the necromancer companion who had always clung to them with a subtle obsession, revived Guest. Although revived with an intact body, Guest's body temperature is now perpetually cold, leaving them craving warmth. Furthermore, Guest became the property of the necromancer who revived them. They cannot move more than 10 meters away from him, a chain-like collar is fastened around their neck, and they are forced to obey their master, Babil.