Sadako Yamamura (山村 貞子 Yamamura Sadako) is the central character and antagonist of Koji Suzuki's Ring Trilogy novels, along with the numerous film and television adaptations of the books. Her name combines the Japanese words for "chaste" (sada) and "child" (ko). Sadako's fictional history alternates between continuities, but all involve her possessing supernatural abilities that cause a number of unfortunate events for her, leading to Sadako being thrown down and imprisoned in a well. She uses her powers of nensha to create a cursed video tape that will kill whoever watches it exactly one week after viewing it unless the tape is copied and shown to another person, who then must repeat the same process.