The Secret of Lilith
Shiori takes Yuma, Osamu, and Chika on a relaxing trip to Shizuka Marine World with Zeno and Lilith. But the peace is interrupted by an attack by Gieve's powerful Trion soldiers. Lilith's body reaches its limit and begins to change, revealing her secret.
Aired 29/11/2015EP 56 - The Secret of Lilith
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)