World Trigger is a science fiction anime series that revolves around the sudden appearance of mysterious portals called 'Gates' from which monsters known as 'Neighbors' emerge. The story follows Yūma Kuga, an enigmatic transfer student, and his interactions with the Border Defense Agency, a group formed to combat these invaders using advanced technology. The series blends action, strategy, and teamwork, offering a unique take on the genre. It first aired in 2014, capturing audiences with its intriguing plot and character dynamics.