"Long, long time ago...God descended down to the world engulfed in darkness. With the threads made from sheep's wool, He created one wondrous piece of cloth, gave rise to another world. That world is known as 'Divine Cloth.'" is the legend that was told from generation to generation.

Beneath the Earth, Divine Cloth, is the world engulfed in darkness. There lives the creatures that were sealed by God known as Bugs. Frequently, Bugs will plunged out to the world, creating holes on Divine Cloth. To fix these holes and reseal the Bugs beneath the ground, two young man and woman, Ryle and Marino then set out on their journey.

(Source: MangaHelpers)