The Seven Deadly Sins & Demons

In a large, empty room sat the Seven Demons.

They sat there together in a roughly formed circle. The door was tightly shut while the world live his life on the other side. First thay create Pride.
And Demons gave her power, and told to surprise them. But as Pride explained, they didn't matter, and Pride could create other sins.
Then Pride turns to the door, opens it, and walks out into the world that had been living completely oblivious to the Seven Sins that were so deadly.
So really, it was the day when all of the Seven Deadly Sins who just walked through the door, and entered our world.