Kivotos is the last remaining city and overall megapolis in Japan, serving as an outlet to help others after the devastating event known as the Death Stranding happened, wiping out not only Japanese cities, but entire countries. With the help from the UCA, United Cities of America, Kivotos gets supplies and other cargo to have delivered to any shelters with surviving civilians. These deliverers are known as porters. The teenager Kouta Hirota is one of these so called porters, mostly doing free lancing in order to get any sort of living from a world in ruins. Everything goes well, until he meets a certain group of girls in the same age as him, and soon all are on one common goal; To reconnect the world, together. Tomorrow is in their hands.