Tatsugoro Saitō, chairman of Saitō High School and a spirit himself, orchestrates the series’ events by tasking the Holy Student Council with gathering seven mystical badges tied to the school’s resident spirits. These badges enable the summoning of specific entities, including his own spectral form, to quell supernatural crises. A collector of cursed relics from global locales, his acquisitions inadvertently amplify ghostly activity within the institution. Though dedicated to upholding the school as a refuge for marginalized students—a place where their struggles are acknowledged—he covertly thwarts efforts by the council president to resign or transfer, binding the group to their ghost-handling duties.

With a diminutive frame, facial hair, and a distinctive dark blue badge, Tatsugoro exudes a blend of cunning and levity. He mentors through mischief, deploying pranks and strategic manipulation to steer both students and spirits. While the manga explores his clashes with an oppositional force aiming to sever human-spirit bonds, the anime streamlines his role into a catalyst for comedic turmoil.

His unorthodox leadership extends to the school’s entrance exams, conducted with phantom assistance to attract uniquely challenged pupils. Many return seeking solace, perpetuating his vision of the campus as a sanctuary. Though transactional in his dealings with protagonists—exploiting their talents to neutralize paranormal threats—he simultaneously ensnares them in his schemes, ensuring their lives remain entwined with the school’s ever-unfolding supernatural drama.