The 28-year-old young man Katsuto Aoyama (Tomoya Nagase) never thought that his life would be so short. Before that, he was muddleheaded and had no ambitions. However, the diagnosis book has caused him to suffer an unprecedented blow. He has a tumor in his brain and will not live long. During his hospitalization, Katsuto met a 14-year-old girl, Harumi Shiraishi (Mayuko Fukuda). Harumi has suffered from a terminal illness since childhood. She has spent all her days in the hospital since she was 7 years old, and her life is slowly coming to an end. Katsuto and Harumi share the same disease and become a pair of friends who forget their age. One night, they sneaked into the hospital kitchen to drink. Katsuto was so excited that he decided to take Harumi, who had never seen the sea, to the beach. The two walked out of the hospital and drove away in the luxury sports car of K3 Enterprise President Kokubo (Keishi Nagatsuka). By mistake, they became armed robbers. The police and K3 people were chasing after them, while Katsuto and Harumi continued to move towards the dreamy sea...