Children of Ursus is a collection of grim stories surrounding the members of the Ursus Student Self-Governing Group, who were locked down in their school, Peterheim Middle, during the Reunion uprising in Chernobog and are implied to resort into violent and macabre acts to survive. It also shows the U.S.S.G.'s efforts to cope with their emotional scarring as a result of their actions and experiences during the lockdown, which may remain for the rest of their lives.