Before the battle against Aldebaran, Rentaro and Enju enjoy the outdoor class with the girls of the Outer District. Because the girls have very little hope and are unsure of their future, Rentaro takes them to a place where humanity had won their last battle against the Gastrea. Only three days remain until the destruction of the Monolith.
Rentaro and President Kisara head to the Defense Ministry after being summoned. All of the reputable civil officers from the Tokyo Area show up there. The one who summoned them there is Seitenshi, in regards to destroying the host Gastrea and recovering the contents of the case that's inside the Gastrea.