Kyoujiro Mikuriya serves as the head of the research center where the Kirihara brothers, Naoto and Naoya, were raised for fifteen years. He is characterized by a distinct appearance, typically depicted with a beard and wearing tinted glasses. Within the narrative, his role is deeply intertwined with the brothers' past, as he is the figure responsible for taking them from their parents and keeping them within the facility. This action has resulted in significant resentment, particularly from Naoto, who holds a strong, enduring anger toward Mikuriya for the captivity and the forced separation from their family.

Despite this deeply conflicted history, Mikuriya perceives his own actions differently, considering himself to have been the guardian and protector of the two brothers throughout their long confinement. His motivations appear rooted in this sense of responsibility and care, even if his methods were not understood or accepted by the brothers themselves. This complex dynamic is further illustrated after the Kirihara brothers escape from the research center. Contrary to severing all ties, they maintain contact with Mikuriya. This ongoing connection culminates in the brothers returning to his aid in a later episode, demonstrating that despite past grievances, a significant and complicated bond remains between them. The narrative does not focus on extraordinary psychic abilities for Mikuriya, but rather on his pivotal role as the administrator of the facility that shaped the brothers' early lives and as a key figure in their personal history.