Sadako Yamamura
Until his partner commits suicide in front of him, Detective Koiso continues to doubt the existence of the film, even when it is revealed that the original broadcast of the online video killed its initial viewers and employees of the site where it was uploaded. Koiso makes his way to Kashiwada's apartment, eager to find answers. He discovers the wallpaper is a horde of white butterflies hiding notes and history. Kashiwada had been attempting to resurrect Sadako Yamamura, as revenge against the human populace for persecuting him. He initially kidnapped long-haired women and threw them down the well, alive. However, when it was revealed that a body could not be found that way, he orchestrated the "cursed video" so that the video would find the perfect host for her.