Ōkubo is a high-ranking official in Japan's Meiji government. When approached by the antagonist organization Inferni, they offer him a position in their ranks in exchange for securing a magical wand capable of reviving the Dark Lord. Ōkubo demonstrates discernment regarding Inferni's motives, remaining cautiously noncommittal to their proposal, reflecting his pragmatic governance. Following the defeat of Inferni's leader, he expresses relief at the threat's end. Ōkubo reaffirms his commitment to advancing Japan's development through conventional political means, explicitly rejecting supernatural intervention and emphasizing human-centered governance over magical solutions, echoing the Meiji era's drive toward modernization.