World Trigger

A rookie’s moral test erupts when a mysterious classmate turns out to be the enemy in disguise.

When a dimensional rift tears open over Mikado City, hordes of hostile entities called Neighbors pour through, immune to bullets and blades. Humanity’s only hope lies with the Border Defense Agency, a covert force equipped with high‑tech weapons known as Triggers that can pierce the alien’s defenses. Years have passed since the first incursion, yet the threat never truly fades, and Border agents patrol the city’s shadows, ever‑ready to seal the breach. Among the rookies is Osamu Mikumo, a diligent but rule‑bound trainee who’s never been allowed to fire his Trigger outside the headquarters. That changes the day a new transfer student, Yuuma Kuga, is dragged into a forbidden zone by school bullies. The area erupts with a swarm of Neighbors, and Osamu is forced to act on instinct. To his astonishment, Yuuma effortlessly dismantles the creatures, revealing himself to be a humanoid Neighbor masquerading as a human. The encounter shatters Osamu’s black‑and‑white view of the war, thrusting him into a deeper conflict where allies and enemies wear the same face, and the line between protection and oppression becomes dangerously thin.

World Trigger is a tactical sci-fi action series where teens use modular energy weapons to defend Earth from interdimensional invaders. The focus is on strategy, teamwork, and character growth rather than graphic violence or mature content.