World Trigger

(I'll change the title later on)
A boy with white hair named Yuma ends up transferring to a new school called Border.
Border is a military school that educates and trains students to fight against neighboring countries.
As the whole world is under a war between the different counties of the world and a few close by to Earth had also been intercepted in this war.
This war has been going for longer than 4 years and isn't stopping any time soon.
Yuma ended up here after being in a war that had lost his father in. He fled to the country that his father new most.