死ガ二人ヲワカツマデ･･･　第一章 色ノナイ青

The film's story poses the possibility that all of humanity, without exception, live in two worlds of existence: the real world and a second world known as "Hemu". Humans live their lives in Hemu when they sleep in the real world. Hidden in each person is another life of which he or she has no recollection of, except for nightmares which are soon forgotten upon waking up. However, there a few rare individuals who are aware of the existence of Hemu and the curious consequences it has on the real world.

Of the more than 100,000 people who go missing each year, those who remain missing for seven years are declared dead and, in the records, cease to exist. These individuals, who continue to live in the underworld, are called "Shibito", and their lives range from those who commit crimes to those who fight in the shadows to protect the nation. Hayato and Keiji, who run a bar, are also among the Shibito, continuing their fight until one day they meet a mysterious woman named Akane, which leads them into a tragic incident.

Inaba Hospital, located in the countryside, is a small hospital with relatively weak medical equipment and medical staff.