Destroy thy Neighbor! A gate to another dimension has burst open, and invincible monsters called Neighbors invade Earth. Osamu Mikumo may not be the best among the elite warriors who co-opt other-dimensional technology to fight back, 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!