The crew of the supply ship E.S.S Ariga receive a old distress call related to Nanostray infection, deciding to investigate it's origins and maybe reverse-engineer it to find a cure. The SHN-4 fighter is sent to Teppeki Dock, from where the distress call came, to investigate further. They manage to collect data on the first three outbreaks of the virus, so the SHN-4 is again sent to collect samples.