The movie Sadako 3D is a horror film and the eighth installment in the Ring franchise. It was released in Japan in 2012 and directed by Tsutomu Hanabusa.
The story revolves around Akane, a high school teacher who becomes involved in a deadly conspiracy after hearing rumors about a video that causes people to commit suicide. When one of her students dies after watching the video, Akane and her boyfriend Takanori begin to investigate and unravel the mystery behind the video.
They soon discover that the video was created by Kashiwada, a man obsessed with the legend of Sadako, the vengeful spirit who haunts the Ring franchise. Kashiwada's plan is to use the video to bring Sadako back to life and unleash her curse upon the world.
As Akane and Takanori try to stop Kashiwada, they are confronted by ghosts and supernatural forces. Along the way, they team up with a group of video bloggers who are also investigating the video and its effects.
The climax of the movie takes place in a haunted building where Sadako's powers are at their strongest. Akane and Takanori must use their wits and bravery to stop Kashiwada and end the curse of Sadako once and for all.
The movie is known for its 3D effects, which add to the horror and suspense of the story. It received mixed reviews from critics, with some praising its visual effects and scary moments while others criticized its complex plot and confusing storyline.