Sadako Yamamura
Finding a document about the videotape, Ando reads that the curse spreads through a tape and can only be stopped by copying and sharing it with someone else; despite disputing the files as pseudoscientific, Ando and Miyashita continue reading into them, and discover that the Ring Virus started with the murder of psychic Sadako Yamamura. Additionally, Miyashita soon discovers that a virus connects all of the victims and comes in two forms: a ring-shaped virus which kills the host, and a broken version of the same virus (similar to a sperm cell) which is dormant.