Penglai Island is said to be the island of gods in ancient times. Qin Shihuang once sent Xu Fu and 3,000 boys and girls to search for Penglai in order to find the elixir of immortality. Humans, monsters and half-monsters live on the island, living in harmony and freedom. In order to prevent the half-monsters from being harmed, the witch Zou used magic to hide Penglai Island, which would only appear once every 50 years with thick fog. However, the evil Four Fighting Gods sneaked in when the island's barrier was weak, polluted the Mingdong Kiln, and ruthlessly ruled and massacred the residents on the island. 50 years before Kagome arrived in the Warring States Period, Inuyasha and Kikyo boarded Penglai by boat and encountered the Four Fighting Gods. In the battle, Inuyasha's power was sealed by the Four Fighting Gods. 50 years later, Penglai Island appeared again. The half-monster Alan took the opportunity to escape, and was chased by the Four Fighting Gods all the way. Fortunately, he was saved by Inuyasha and his party. In order to save the residents on the island, Inuyasha, Kagome and others decided to step into Penglai. On the other hand, Alan's sister Qian Cong decided to jump into the kiln to save the lives of her brothers and sisters...