Ōka Midarezaki spearheads a government program designed to avert planetary annihilation by forging artificial kinship bonds among individuals carrying dormant traits of an apocalyptic entity. Orphaned at three with no recollection of his past, he was molded by a paranormal measures bureau to repress emotional connections, forging him into a detached yet ruthlessly efficient operative.

Now commanding the bureau’s operations division, Ōka oversees a manufactured household of candidates bearing destroyer-god DNA. He approaches the role with calculated detachment, maintaining icy composure against relentless provocations from Kyōka, the household’s self-declared divine "matriarch." His clinical pragmatism fractures under pressure, manifesting in startling acts like drawing his service weapon during meltdowns—even once pressing the barrel to his own temple.

Forced proximity to the family erodes Ōka’s emotional conditioning. Though he initially declares himself incapable of affection, he develops authentic feelings for Kyōka and fierce protectiveness toward their makeshift kin. This shift surfaces through unguarded moments, such as publicly confessing his deepening bond with Kyōka—a stark departure from his former impassivity.

His dual existence as bureaucrat and pseudo-patriarch forces him to marry bureaucratic discipline with the household’s anarchic energy. While the mission’s success depends on this balancing act, his rigid protocols frequently collide with the group’s chaotic solutions. Ōka’s journey from emotionally-starved operative to devoted patriarch culminates in thematic emphasis on connection’s disruptive force, playing out against the story’s surreal backdrop.