Thousands of years ago, a ball of demonic fire appeared in the palace of Athena. This mass of demonic fire was formed by the grievances of the demons. This demonic fire is so powerful that it is sealed in the Heart of the Elements by the goddess Athena. The goddess Athena has always sent nine elemental masters of gold, wood, water, fire, earth, wind, rain, thunder and electricity to protect it. But as the day grows longer and the night grows stronger, the seal that seals the demonic fire becomes weaker and weaker. Finally one day, the seal of the magic fire began to weaken. The Demon King single-handedly attacked Athena's palace, preparing to snatch this powerful power. Athena sent nine elemental masters to fight, but what she didn't expect was that something unexpected happened.