A mysterious man, known only as 'Phantom' appeared in Tokyo- the capital city of Japan- and manipulated vulnerable adolescents into fighting each other, bestowing upon them mystical weapons of great strength known as 'Fu-mension Artifacts.' In exchange, he promised to grant their wish if they survive. Unbeknownst to the combatants, the fierce clashes between Fu-mension Artifacts caused distortions in space-time, which compromised the boundaries between parallel universes. The collapse of these parallel universes would ultimately break the seal, unleashing Phantom's destructive powers.