Seido Hishigata is the father of Sou and Tokiko. He serves as the director of Hitogashima's only hospital, the Hishigata Clinic.
[It is revealed later in the series that Seido Hishigata used his clinic as a front to hide his affiliation with [Haine)(https://anilist.co/character/155704/Haine) where he would feed the bodies of the deceased to her.]
