Takeshi Hongo is a promising young man with a passion for motorcycle racing. However, his dreams are suddenly ruined when he gets kidnapped by Shocker, the evil secret organization planning to dominate the world. After being remodeled into a cyborg, Takeshi escapes and swears to protect the world from the inhuman monsters.

Izumi Sakuragi is a new police sergeant with the Special Investigations Office, which was set up within the Metropolitan Police in November last year. The new investigation team uses DNA analysis and the latest in forensics science to investigate cold cases as well as cases suspected to involve missing persons.

Five years have passed since the events of Sadako 3D. Akane is pregnant with a child with her boyfriend Takenori. However, Akane dies after giving birth to her daughter. When Takenori's sister Fuko takes up the task of caring for Akane's daughter, the infamous cursed video resurfaces. During her investigation, Fuko learns about the legend of Sadako's daughter...

Set 2 years after prior film "Bayside Shakedown 3: Set the Guys Loose," a major case occurs that has the potential to take down the entire police organization. For the next 3 days, Shunsaku Aoshima and his colleagues struggle to unravel the case...

Newspaper correspondent Kyoko Togakure visits a nursing home in the outskirts of Tokyo. She finds the dead body of a resident. It was an apparent suicide. He's holding a piece of paper with the mystifying word "Death Water" written on it. Nearby are blood-stained scissors, and his eyes are squashed. She has no idea that this death is just the beginning of a horrendous nightmare.

There is an old love hotel in Tokyo's Shinjuku district where couples can rent a room by the hour for romantic assignations. However, few of its regular customers seem to come there for sexual encounters; the hotel has become a hangout for rootless teenagers, senior citizens looking for a place to relax, and kids that play under the watchful eye of its owner...

Two office workers visit a colleague who no longer comes to work. They discover something unexplained and frightening.