A young pathologist seeks answers to the mysterious death of a friend and soon comes into contact with the same cursed videotape that caused the death of the friend's wife and son, which is haunted by the curse of Sadako, a relentless spirit.

After the assassination of Tokyo's Governor by Yakuza members, the CIA bureau chief for Tokyo puts out a call to an agent that had been raised in Japan and trained by ex-Yakuza. Using his former ties, he quickly determines that a war is brewing between old-guard Yakuza members and a young, crazed leader with ties to the Chinese Tong.

Teenage math whiz Kenji Koiso agrees to take a summer job at the Nagano hometown of his crush, Natsuki. When he arrives, he finds that her family have reunited to celebrate the 90th birthday of their matriarch. His job: pretend to be Natsuki's fiancé. Meanwhile, his attempt to solve a mathematical equation causes a parallel world's collision with Earth.