You thought your neighbors were bad...but at least they're not aliens trying to kill you!

Earth is under constant threat from Neighbors, invincible monsters from another dimension that destroy our way of life. At least we have the elite warriors of Border, who co-opt alien technology to fight back! Meet agent Osamu Mikumo, not the best, but along with his Neighbor friend Yuma, he’ll do whatever it takes to defend life on Earth as we know it.

Day six of the Sealed Environment Phase commences, and Wakamura’s Squad relies on Hyuse’s knowledge to complete their assignments. Meanwhile, Suwa’s Squad takes on the day’s sim battles using Osamu’s strategy, but all of their moves end up being countered! Will they be able to bounce back in the rankings?