As the search for equilibrium among Earth's three races reaches a critical juncture in present-day Japan, guardians from the Juujinkai strive to shield a reluctant high school student and his partner from encroaching Makai adversaries. Doubts about the young man's true nature fuel relentless attacks, forcing swift defensive maneuvers and deepening bonds of loyalty. Amid rising supernatural confrontations, the fate of all realms hangs on whether this potential savior can withstand the mounting opposition and fulfill his prophesied purpose.