Beyond the distant sky lurks an invisible darkness. The firmament is nothing but a black curtain, cutting this land off from the outside world. What lies beyond the world? The powerful of countless ages have sought the answer...
An old book from some unknown era passed down these words: "This world is cursed. Once every thirty thousand years, a great calamity will strike, and only mortal children under the age of ten will survive... The only safe place lies beyond this world..."
To escape the curse, countless powerful figures cultivated tirelessly, striving to break through the black curtain and find a new home!
