Once upon a time,
There was a light.
A light that illuminated each person's heart.
Everybody was so happy about it for they showed pleasant traits towards each other.
And they just can't explain their happiness.

But that happiness didn't last.
The light was suddenly eclipsed by a dark silhouette.
People are starting to panic as the light that shone from their hearts was suddenly covered.

The silhoutte showed its lips.
Licking it like a predator ready to devour its prey.
As the people are in panic, the silhoutte started to devour them. One by one.
The people have no escape.
They faced their fate head on.

The dark silhoutte looks satisfied, a wide smirk plastered on his face.
The silhoutte started laughing. A laugh that matches a demon's.
People are nowhere to be seen.
The silhoutte already corrupted their once pure heart.
No one escaped from it.

And the light vanished as the silhoutte took reign over the people's hearts.

Pain

Agony

Hate

Anger

That's all there is to it.