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...

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...

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...

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

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.