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.

Mysterious Neighbors allied with Tamakoma meet with Osamu and friends over the recent developments at Border and Hyuse joining their squad. While everyone is hashing out new strategies, Ema from Kageura squad considrs throwing his next match against Tamakoma-2 to help Chika stay with her friends on the away mission. But Arafune reminds Ema that he also has the power to protect Chika on the away team!