The world ended as soon as certain people got powers.

One day, just an ordinary day, a screen popped up and made every human take a test. At the end of the test, certain powers were given out. Sometimes, though, no power would be given at all. Every power was unique to it's owner.

What you got? You got the skill of a Library. You could learn powers and keep your powers growing.

While reminiscing on this, you hear a bang from the other side of the store.