The prequel to the horror film Ringu, this movie provides the background story of how Sadako later became the vengeful murdering spirit. The story starts with her as a shy, somewhat withdrawn, college student who nonetheless gets involved in a drama club. The director thinks she has talent, but some of the other performers start to get jealous of the attention he gives her. Meanwhile, a reporter investigating Sadako's spiritualist mother thinks there's something very suspicious about the young woman, and arrives on campus to confront Sadako just as a series of strange deaths start sweeping through the drama club.

Genji and his victorious G.P.S. alliance find themselves facing down a new challenge by the students of Hosen Academy, feared by everyone as 'The Army of Killers.' The two schools, in fact, have a history of bad blood between them. And the simmering embers of hatred are about to flare up again, burning away any last remnants of the truce they had so rigorously observed until now.

Dr. Hattori and her husband watch footage of brain surgery experiments with Manchurian, Russian and Japanese guinea pigs that had been found in the basement of a wrecked hospital. Out of the blue, there is a white light and when they look back, they see they children Ota Miyuki and Kaori staring at the light. Years later, Miyuki vanishes from the Tama Medical University Hospital and her sister Kaori, Miyuki's boyfriend Motojima and detective Hirasawa are seeking her. However, Miyuki and the teenagers Kazochi, Takumi, Hattori and Rieko have been submitted to a nightmarish experiment by Dr. Hattori and her team with tragic results.