Kazumo serves as an operative of the Gabi, a clandestine order dedicated to battling Busoma—twisted creatures forged from cursed weapons. During a pivotal confrontation, he intercepts Gai moments after the latter severs his own demonic prosthetic arm and teeters on a building’s edge in a suicide attempt. Kazumo retrieves the fallen warrior, delivering him to the Gabi’s sanctuary, where he ensures Gai’s survival and secures his place within their ranks. This intervention not only spares Gai’s life but thrusts him back into the war against the Busoma, where he must now confront both the encroaching horrors and the erosion of his humanity.

Kazumo’s decisive action highlights the Gabi’s opposition to the Shoshidai’s ruthless methods, though his personal history, skills, and deeper motivations remain veiled. Though marked as deceased, the events leading to Kazumo’s demise remain shrouded, his legacy defined solely by this singular, transformative rescue that alters Gai’s fate.