The movie is set in the near future, when the “ARK Project” has initiated a program to increase the quality of human life through the peaceful use of robots. Dr. Komyoji, the chief scientist on the project, has developed a process to create a robot with a figurative human “heart” through the installation of a “conscience circuit”, but his plans are violently opposed by researcher Gilbert Kanzaki. When Dr. Komyoji is killed in an apparent accident, his children Masaru and Mitsuko are targeted by mysterious forces within the ARK Project looking to gain control of the scientist’s research data. But the villains are opposed by Jiro, the android with a human conscience who fights for justice as the hero Kikaider.

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 The story starts with her as a shy, somewhat withdrawn, college student who nonetheless gets involved in a drama club.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. Written by Jean-Marc Rocher rocher@fiberbit.net

Reiko Asakawa is researching into a 'Cursed Video' interviewing teenagers about it. When her niece Tomoko dies of 'sudden heart failure' with an unnaturally horrified expression on her face, Reiko investigates. She finds out that some of Tomoko's friends, who had been on a holiday with Tomoko the week before, had died on exactly the same night at the exact same time in the exact same way. Reiko goes to the cabin where the teens had stayed and finds an 'unlabeled' video tape. Reiko watched the tape to discover to her horror it is in fact the 'cursed videotape'. Ex-Husband Ryuji helps Reiko solve the mystery, Reiko makes him a copy for further investigation. Things become more tense when their son Yoichi watches the tape saying Tomoko had told him to. Their discovery takes them to a volcanic island where they discover that the video has a connection to a psychic who died 30 years ago, and her child Sadako... Written by Hana Jo Gilmour