In ancient century, humans built up Enochian Tower, attempting to reach Gods. However, Devils in Hell tried to exploit the Tower to invade Heaven. A bloody war between Gods, Devils and Humans (Three Worlds) broke out, triggering Gods’ anger.
Gods desperately broke the Top of the Tower and sealed Devils in it. As times goes by, conflict among Three Worlds continues to disturb the world peace. The last hope lies on the Summoners who can unleash the Seals and wipe out all the Devils!