Suwa Squad and Arafune Squad
Mikumo Squad's B Rank Competition debut ends in a stunning win. Their next opponents are the 8th ranked Suwa Squad and the 10th ranked all-Sniper Arafune Squad. Osamu tries to come up with a Tamakoma-support strategy, but can he lead his team to victory?
Aired 26/07/2015EP 39 - Suwa Squad and Arafune Squad

World Trigger
One day, a gate to another world suddenly opens in Mikado City. Aliens invincible to Earth’s weapons, called “Neighbors”, start coming over. Earth’s only line of defense is a mysterious group called the “Border” who are armed with weapons called “Triggers”.
Four years later, the city has recovered from initial attacks and citizens of Mikado City have started to get used to the Neighbor’s attacks. Yuma Kuga, a transfer student, and his classmate Osamu Mikumo find themselves fighting a Neighbor that suddenly appears. Osamu, who is actually a Border agent, activates his Trigger but is unable to defeat it. This leaves Yuma to activate his own Trigger and defeat the alien. Yuma reveals that he is not part of Border and is actually a Neighbor who has transferred from the other side.
(Source: Crunchyroll)