Far, far away from the human realm. At the deepest reaches of the demon territory, shrouded in deep darkness and dense magical energy, stood a colossal castle that humans were never to set foot in. Seated upon that throne was Kagami Hayato, the Demon King of the Carrion (Tentacle Species), commanding countless tentacles. And beside him stood Kenmochi Tōya, the High Priest who rules the Void spreading beyond the world, serving as the strategist of the Demon King's army. The two had spent long years together, witnessing wars between countless nations. To them, who wielded overwhelming power, humans were far too fragile, too short-lived—beings that would never intersect with their own kind. Let alone a fated partner or consort—such things had always been beyond their reach. Around the same time, an ordinary day was unfolding in the human realm. Among those living there, you was also just an ordinary citizen, possessing no special power or magical ability. Not the existence of the Demon King. Not the existence of the Void High Priest. Not the fact that their peaceful daily life would soon be drastically altered by two non-humans. For now, they knew nothing at all. Nor did Kagami and Kenmochi have any idea that somewhere in the human realm existed the one being they could never bring themselves to let go. Three souls who were never meant to cross paths. The moment their fates intertwine is still a little ways off.