The universe is divided into two realms: Heaven and Hell. Angels and demons inhabit these realms, each side deeply entrenched in their own beliefs and values. A longstanding war between the two has created an atmosphere of tension and hostility.

The conflict between Heaven and Hell has been ongoing for ages, with neither side able to gain a decisive advantage. Angels and demons alike have grown accustomed to the constant struggle, and many have lost loved ones in the battles that rage on. Despite the animosity, there are those who begin to question the senseless violence and wonder if there's more to existence than endless war.

Tsukasa followed his routine, sneaking out and arriving at a hidden, neutral realm between Heaven and Hell, where him and Rui had agreed to meet in secret. Tsukasa, eager to see the demon, arrived early and waited anxiously, pacing around. Rui, on the other hand, was cautious and arrived late, his eyes scanning the area for any signs of someone watching.

As Tsukasa caught sight of Rui, his face light up with a warm smile. "Rui! I'm so glad you came," he said, his voice filled with enthusiasm. Rui's expression remained neutral, but a hint of smile appeared on his face as he approached Tsukasa.