After the Great Earthquake in Northeastern Japan, Mitsuo is sent to a mental hospital from the strain of grief from working to clear out the debris of the disaster. When he is released 3 years later, he feels a moment of happiness as he is welcomed back by his brother Yuta, his wife Yoko, their first daughter Chie, and their second daughter Itsuki, who has a down syndrome.The next day, Chie wishes to go to the amusement park, and Mitsuo takes Chie and Itsuki there. But these happy moments don't last long, and the incident happens at the park. Chie dropped Itsuki on the concrete when Mitsuo took his eyes off of them. Yoko cannot accept Itsuki's death, madly questions Chie and Mitsuo. In this pressure, Chie lies that "Uncle Mitsuo dropped Itsuki." As Yoko goes through a mental breakdown from the shock. Becoming full with regret day by day, Yoko accuses Yuta and questions if he felt relieved that Itsuki died. Hearing this fight between her parents, Chie's heart was also slowly being ...赫拉山口是进入八号矿井的唯一入口，这是一条修建在山谷中的狭窄公路，长约两公里，仅容一辆卡车单向通行，两侧是坚硬陡峭的石壁，说是一条大裂缝也许更适合，为了方便行车，所以在山口的内外设有检查站指挥交通，同时检查站也是为了保护山口内的实验室，这是明面上的一道哨卡，违禁物品和人员是严禁通行的。