On a massive rock formation under a crescent moon, an old wizard tells a magician that there are others in this world who hold the same power of "Seven" that he does, and he must find these holders of "Seven"; the "Sevens". The magician repeats the term and the wizard explains that when all the "Sevens" have gathered on the night when the moon is full enough to be hardly recognizable, a man will carve open a new path and guide the world as the King of Duels...