Sadako, also known as Sadako KOL, is a 2019 Japanese supernatural horror film directed by Hideo Nakata. Loosely based on the novel Tide by Koji Suzuki, the film is an installment in the Ring franchise, and a sequel to Nakata's 1999 film Ring 2. The film centers around a vengeful ghost named Sadako Yamamura who is associated with a cursed video tape; whoever watches the tape is killed seven days later.