Gate Keepers 21

At the beginning of the new century, Ayane Isuzu secretly hunts Invaders while living by day as an isolated student. Working with the remnants of the A.E.G.I.S. network and devices that summon Gate powers, she approaches the mission with resentment rather than idealism.

The emergence of a new Gate Keeper, Miu Manazuru, brings her an unlikely partner as old threats return in forms increasingly difficult to separate from humanity itself. Ayane must confront both the enemies around her and the question of what is worth protecting in a society she no longer trusts.