Abyssbell, known as the Jashin Emperor or Jashin-kun, emerges as a mysterious entity from a ruined world beyond the Boundary Line—a realm shattered and abruptly severed from humanity. From the shadows of this other dimension, he contacts Win Kirifuda, displaying familiarity with human constructs like the dark web's illicit "Demon Lord" network, where murder contracts and trafficking unfold. His exchanges with Win carry cryptic warnings of imminent conflict, declaring that "the duel to take everything back will happen soon."

He monitors events across both worlds, witnessing widespread murders linked to Ballom—incidents tied to an undisclosed "contract" involving a figure named Kyoshiro. Abyssbell connects to the Crystal Card, entrusted to Win by Crysta, which commands a staggering 15-billion-yen value in dark web trades. His influence intertwines with the "Reaper of the Moonlight" narrative, entangled with ancient forces like Imish Itzayana—an "ancient god" who steals hearts and bends human bodies to its will.