London, 2027. In this dystopian world, human beings have been unable to reproduce offspring for eighteen years. The reason is unknown, that is, the species is about to become extinct. Britain is the only civilized society left on earth, which leads people to want to immigrate there. As a result, it has become a police state that deals with migrants placed in refugee camps. The humble government bureaucrat Theo Faron was once an activist, but Fish, considered a terrorist organization, approached. The organization was led by his ex-wife Julian Taylor, who was already near Not seen in 20 years, their marriage broke up after your death. little boy. Dylan during the 2008 influenza pandemic. Although Yu did use terrorism to fight for the rights of immigrants in their ongoing anti-government revolution, Julian vowed that they can only gain support by talking to the people now. What she wants is for Theo to use his contacts to obtain transit documents for a young immigrant named Kee who needs to go to the coast. Although initially reluctant to do this due to difficulties, Theo was able to give Julian this favor, but as he now needs to accompany him on the journey changes. As Theo and Kee progressed during their journey, Theo became more and more aware of what was happening, including why Kee needed to go ashore, no one on the team knew whether their final destination existed, and the lives of him and Kee were better than they started their journey. The danger is even greater when I realize it. But Theo's sole mission is to help Kee at all costs to maintain the survival of the species.