In a mysterious ice and snow area on the earth, there is a group of people living there. They have lived in that area for generations.
There, there is the most advanced civilization, the most developed technology, and the most powerful warriors. The people there have an oath to never leave this land and have the courage to defend it to the death.
The story begins when a group of people, for various reasons, break into this mysterious and ancient area step by step, uncovering the mystery of this area step by step.
That land, the people there call it the Icefield.