Spiral

The film's central supernatural force, Sadako emerges as a vengeful spirit whose presence drives death and mystery. Reborn and claiming to be 'perfectly dual-gendered,' she manipulates events from the shadows and orchestrates the curse that haunts the investigators. Her power blurs the line between science and myth as characters tire of rational explanations and chase control over a fate they barely understand.

A pathologist and rival of Ryūji Takayama who is consumed by grief after the death of his child. He pursues the cursed videotape's secrets, risking his own life as the line between scientist and believer dissolves. His search exposes the vulnerability of rational inquiry when faced with a force that operates beyond measurement.

Takayama's student and ally in uncovering the tape's origins. She becomes a crucial link between Andō and the unfolding mystery, navigating fear and moral questions as the case deepens. Her involvement pulls her into a dangerous world where truth and danger intersect.

A colleague within the investigative circle who contributes to the pursuit of answers. He provides perspective and information that pieces together the tape's history and its victims. His presence helps frame the scientific approach to the haunting.

A member of the investigative network who aids in uncovering the tape's patterns. He adds practical support and pushes the investigation forward, helping to reveal the consequences of the curse.

A member of the research or medical team whose role is supportive in connecting the medical and archival threads of the case. She offers practical assistance as the investigators pursue leads.

Another figure in the investigative milieu who contributes to the unraveling of the tape's history. Her presence adds to the collective effort to understand the curse and its victims.

A member of the investigation circle who assists Andō and others as the mystery deepens. She acts as support within the group navigating fear and the unfolding events.