Part One
A mysterious being, the Beholder, creates a white orb later named Fushi by a spirited girl. Initially a rock, Fushi takes the form of a dying arctic wolf and meets a lonely boy who mistakes him for his lost pet. After the boy's death, Fushi adopts his form and travels to Ninannah, where he encounters March, a girl destined as a sacrifice to a monstrous bear, Oniguma. March teaches him language and names him. Upon defeating Oniguma, Fushi, March, her protector Parona, and the elder Pioran are captured by the warrior Hayase. Though they escape, March dies shielding Parona, her spirit lingering. Fushi flees Ninannah, evading Hayase's pursuit.
With Pioran, Fushi learns speech. En route to Takunaha, they battle a Nokker—a parasitic entity that steals his forms—but reclaim what was lost. There, he befriends Gugu, a disfigured boy who sacrifices himself for Rean, who then becomes a spirit. For four years, Fushi lives as a human until Gugu's death forces him to leave. Hayase manipulates Tonari into luring Fushi onto a prison ship bound for Jananda Island. In gladiatorial combat, Hayase reveals she murdered Parona and impersonated her, infuriating Fushi. Overpowered, Fushi is saved by Tonari's intervention. When Nokkers attack, killing Tonari's allies, Fushi destroys them and abandons Hayase at sea. Reuniting with Pioran, he retreats to an island where her dementia worsens. Before dying, she asks the Beholder to reincarnate as something useful—returning as a horse.
For forty years, Fushi isolates himself until Nokkers target humans again. He meets Hisame, Hayase's reincarnated granddaughter, whose arm harbors a Nokker. After clashing with the now-adult Tonari, Hisame flees. Tonari dies, joining Fushi's spirits. Over centuries, he avoids humanity, but Hayase's descendants—like Kahaku—pursue him, forming the Guardian Force, a cult opposing Nokkers.
Captured by Prince Bonchien, Fushi is coerced into demonstrating resurrection. After escaping, he and Bon prepare for a Nokker assault on Renril. Disguised as Booze Man, Fushi reshapes the city, reviving March accidentally. Three allies die, but Bon reveals they can be restored. When Kahaku's Nokker overwhelms Fushi, Bon sacrifices himself, allowing Fushi to regain strength. Reviving his allies, Fushi secures victory. Kahaku later takes his own life, confessing his devotion.
Part Two
Fushi vows to create a peaceful world and resurrect his fallen companions before entering a centuries-long slumber, his essence spreading across the planet to suppress the Nokkers. Unbeknownst to him, the Nokkers survive by evolving into microscopic parasites, hiding within human hosts. The one that once possessed Kahaku now lurks within Mizuha, the eighteenth reincarnation of Hayase, secretly rallying the remaining Nokkers for Fushi's eventual return.
Awakening in the modern era, Fushi revives his eleven spirit companions—March, Gugu, Tonari, Bonchien, and others. The Beholder appears as a boy named Satoru, while Fushi crosses paths with a teenager, Yuki, and Mizuha, who—as Hayase's latest incarnation—becomes obsessed with him. When Mizuha kills her mother, only for the woman to inexplicably revive, Fushi realizes the Nokkers never vanished—they have integrated into humanity. Torn between eradication and coexistence, his hesitation allows Hayase's Nokker to retaliate, attacking Yuki's school.
Though Fushi destroys Hayase's Nokker and dismantles its network, others remain hidden in society. Satoru offers him omnipotence, but Fushi refuses. Before erasing his own memories, Satoru reveals he created the world out of boredom, longing to perish within it—and now entrusts Fushi as its eternal guardian.
Six decades later, with Nokkers widely known and Yuki gone, Fushi leaves with his resurrected friends, continuing his timeless watch.
