Like Ubist, the Abyss Eating Snake, Kaik, originated from the Demon World.

Originally, Kaik had been an insignificant creature, one that roamed the depths of the abyss river that flowed through the Demon World.

It had been smaller than a worm. 

But when a hole was punctured in the wall that separated this world and the Demon World, something terrible happened.

Ubist, a beast that ate everything in the demon world and even the abyss itself, completely knocked down the wall and crossed over to this world.

Fortunately, the Guardian of the Continent, Valan, managed to seal Ubist, and the wall that separated the two worlds was promptly fixed.

However, Kaik, which traveled along the abyss river, was forced into the Arth continent. To Kaik, a demon that lived in the darkness, the sunlight was like poison to it.

In order to survive, it hid itself within the shadows, and was eventually taken to the Shadow World, a black and white world devoid of light. 

After that, Kaik absorbed the Shadow World's power and gradually became larger and stronger. However, it didn't know how to use its power.

One day...

An unfamiliar...