After successfully holding off the invasion by Aftokrator, the Border Defense Agency prepares an away mission into the Neighbor's dimension. However, like in previous scouting expeditions, only A-rank teams are certain to secure a spot. As the B-rank wars continue, Osamu Mikumo and the rest of Tamakoma-2 quickly fight to the top in an attempt to obtain a promotion before the operation begins. Meanwhile, a new Neighbo...