When a gate to another world suddenly opens on Earth, Mikado City is invaded by strange creatures known as “Neighbors,” malicious beings impervious to traditional weaponry. In response to their arrival, an organization called the Border Defense Agency has been established to combat the Neighbor menace through special weapons called “Triggers.” Even though several years have passed after the gate first opened, Neighbors are still a threat and members of Border remain on guard to ensure the safety of the planet.
3 seasons total. Season 1 has 73 episodes and season 2 & 3 aired recently both just 12 episodes. Season 3 is still currently ongoing. Lots of strategy, world building, character growth & great fight scenes. Good if you’re looking for a kinda long running show with around 100 episodes total.
Agreed