A desperate attempt to summon legendary heroes goes horribly wrong. Instead of saviours, they get Class 2K: nine kids from a Tokyo international school, all from different countries and backgrounds.

They weren't what the prophecy ordered.

Treated as expendable weapons, not heroes, the class is forced into a brutal training regimen to get ready to fight against the other races in this fantasy world.
As they struggle to survive and control newfound powers, they're pushed towards a war they don't understand. And the closer they get to the front lines, the more they start to wonder:
who are the real monsters in this story?