Tsukiko, who belongs to a photography club at high school, always feels inferior to her elder sister, Tomie. Tomie is breathtakingly beautiful and popular among the male students, including Toshio, whom Tsukiko is secretly in love with.

One day an awful accident kills Tomie right in front of her younger sister. Since then Tsukiko suffers from a nightmare night after night. A year later Tsukiko and her parents are silently surrounding a birthday cake to celebrate dead Tomie's 18th birthday. Suddenly they hear eerie knocks on their door. Unbelievably, it is Tomie. She's back. The father and the mother blindly welcome Tomie in tears, but Tsukiko feels instinctive fear. Tomie gradually reveals her true face only when she is with Tsukiko. Now Tsukiko's nightmare becomes reality, and the terrifying days begin...