Long ago in the High Heavens lived a celestial god named Long Mao, his fairy wife, Yuying, and his 4 sons: Honglong, Liulong, Huanglong, and Heilong. They lived very happily in the Celestial Gardens. However, their happiness did not last long after Long Mao received a gift from the Jade Emperor: The Imperial Sword.

The Imperial Sword was developed by Pangu, the Great Creator, as a weapon used to reset the world if it deemed not suitable for life. It was never used and passed on as an heirloom from god to god. The Jade Emperor believed that Long Mao is deemed well responsible for taking care of the sword after his long-term service to the High Heavens as High Ambassador to the Andromeda Galaxy, another Heavenly body, and the Underworld.

Long Shi, the evil younger brother of Long Mao, sought to reset the world under his rule with the Imperial Sword. He conquered and ruled the Underworld for many years. Long Shi decided to invade the Celestial Gardens and take the sword. Long Mao decided to give the sword to his four sons and leave the palace. Long Mao and his wife died afterward. 

The four brothers, known as the Dragoncat Brothers, went their separate ways and advised their servant to protect a future immortal descendant, a man named Justin, who will fully understand the sword’s power and see its proper destruction. The descendant will have the power to destroy the sword that no one will possess. Not only will the descendant destroy the sword, but also bring peace to the immortal and mortal realms.