Den'ichirō Hakama is a corrupt politician who receives aid from the primary antagonist, Cerebrum, on multiple occasions. Cerebrum provides this assistance to further his own sinister machinations, though the specific nature of their political dealings remains undisclosed. Hakama's collaboration positions him as a minor antagonist in the narrative, and he contributes to the broader conflict by enabling the forces that create Daemonia.

Eventually, Den'ichirō Hakama is disposed of by Cerebrum once his usefulness concludes. This act demonstrates Cerebrum's merciless nature and the peril faced by those who enter into agreements with him.