Bologue had two major mysteries in his life. One was why he had descended into this world, and the other was who the devil he had made a deal with truly was.
Unlike the Tyrant and the Crimson Queen, these two devils could be contacted in many ways, even face-to-face communication. Yet the devil who traded away his soul was different. Since Bologue became a debtor, that devil vanished, never to appear before him again.
Bologue forgot the contents of the transaction, only remembering that it happened during the battle of the Fall of the Holy City. But when the deal was complete and he awoke again, many years had passed.
His memories became blurred and fragmented, even the devil's appearance was unclear, as if the devil had never existed.
Initially, Bologue did not care much, but as he learned more about this world, he became keenly aware that all conflicts seemed to stem from the Fall of the Holy City, and it was within the Fall that he became a debtor.
