A lifelong love of flight inspires Japanese aviation engineer Jiro Horikoshi, whose storied career includes the creation of the A-6M World War II fighter plane.

Amemiya is an unpopular Youtuber who specializes in the occult. One day, his manager brings him a floor plan with an inscrutable point. With the help of Kurihara and Yuzuki, he begins to look into the plan and reveal the mystery behind.

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...