Ugachi, a kyouma demon bound to a volatile black orb, wields the rare ability to dominate humans without fully possessing or consuming their souls. This orb unleashes annihilation by absorbing nearby matter into destructive surges. Orchestrating assassinations within the anti-demon task force, Ugachi’s schemes claimed Jutto’s mother during a botched rescue led by Kagami—an encounter ending when the orb impaled her heart, cementing Jutto’s bitter hatred toward Kagami.

Exploiting its influence, Ugachi later hijacked Junichi Sakamoto, a high-ranking anti-demon minister, covertly advancing demonic interests until Kagami’s mirror magic unmasked the corruption. Though Sakamoto fell, the indestructible orb endured, resurfacing to disrupt Hajime Shirogane’s summit with catastrophic force.

Investigator Farina Nanao identified Ugachi’s expendable pawns during her probes, yet the demon itself eludes detection, operating as a shadowy puppeteer furthering inscrutable supernatural ambitions. No records clarify Ugachi’s origins or motives beyond its role as an elusive architect of chaos.