Aguri Io, a Neo International Defense Force operative under Shu Aiba’s command, survives a catastrophic clash with the Hadeans only to emerge reborn as a semi-Necrodiver after exposure to the Book of the Dead. This metamorphosis amplifies his combat prowess, mirroring the fates of fellow squad members who reappear as adversaries or allies with augmented powers. Once aligned with Shu, Aguri pivots to opposition, fueled by smoldering jealousy and unresolved history, his motivations threading tension through their encounters.

His combat style integrates unnamed specialized techniques—their intricacies withheld until pivotal confrontations—while his appearance commands attention: piercing-adorned features framed by a jagged hairstyle that veils one eye, crafting a visually arresting silhouette. As a transformed N.I.D.F. veteran, Aguri navigates fractured loyalties and internal strife, his choices echoing the saga’s themes of betrayal and humanity’s fragile defiance against annihilation. Though his past remains shrouded, his actions crystallize the moral ambiguities haunting those who straddle the line between survival and sacrifice.