Dead bodies with eyeballs ruptured are continuously found. Their direct causes of death are heart attacks and they acted like they were possessed right before their deaths. Mizuki is a university student. Her friend dies in front of her. Meanwhile, Haruo’s younger brother dies. Mizuki and Haruo begin to investigate together. They learn that Eiko holds a key to the mystery. Soon, Eiko's eyeballs rupture and she dies by a heart attack. Before she dies, she mentions the word "Shirai-san.”
Etsuro Kurosu faills getting into a university and becomes a hikikomori. One day, he tries to hang himself from a hook on the wall in his apartment. He fails, but his attempt leaves a hole in the wall. Through the hole wall, Etsuro Kurosu can now see Rio Miyaichi. He becomes fascinated with the girl that lives next door. Later, while peeping at her through the wall, Etsuro Kurosu sees her in the process of brutally murdering someone. He screams and is caught by her. Etsuro Kurosu confesses that he loves her and they start to date. Etsuro Kurosu feels happiness in his life, but what will happen to him? Will he be murdered by Rio Miyaichi?
Set in World War II, the film depicts the story of the real-life Japanese battleship, the Yamato, which is confronted in the Pacific Ocean by giant monsters, including the most fearsome of them all, Reigo.