Tadashi Shimoda works as a prison guard at the facility housing death row inmate Hirofumi Satake. His duties involve regular interactions with prisoners and assisting in execution procedures, specifically the psychologically taxing task of holding the rope to prevent swaying during hangings. Despite their positions as guard and prisoner, Shimoda and Satake form a connection through shared discussions about books. When Satake unexpectedly survives his execution, Shimoda's direct involvement with him ends as Satake is transferred into a research program studying unusual human phenomena. His documented role concludes at this point.