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