Agashi established Neutral City within the towering ruins of an ancient metropolis, creating a fragile buffer between the sentient Forest and Ragna’s militant empire. A visionary leader, he championed peace between humanity and the Forest—a sentient entity controlling Earth’s dwindling water reserves in a post-cataclysm era.

Genetically enhanced by the Forest to wield superhuman abilities, prolonged use of these powers hastened his transformation into an arboreal form. By the story’s onset, only traces of his humanity remain, his body nearly fully fused with bark and roots. Days from complete metamorphosis, he clings to sentience, delivering urgent counsel to his son, Agito, to shield the Forest from Ragna’s annihilation campaigns.

His past shaped Neutral City’s core tenet: equilibrium between nature’s sovereignty and human survival. This philosophy directly opposes Ragna’s ambition to eradicate the Forest and reclaim a lost world. In his final hours, he imparts to Agito the inextricable link between humanity’s fate and the Forest’s survival, framing harmony as nonnegotiable.

His acceptance of becoming one with the Forest embodies the cyclical symbiosis he preached. This sacrifice galvanizes Agito to undergo the same genetic enhancements, perpetuating his father’s mission to mediate between warring worlds. His legacy endures as a testament to coexistence, etched into Neutral City’s foundations and Agito’s resolve.