Centuries after the snake demon was sealed away, young waiter Luo Xiaotian encounters the mystical Chengying Sword through its loyal donkey and must navigate a series of trials to master its power and stop the demon from wreaking havoc.

A group of young people go on a graduation trip to a remote island. Unbeknownst to them, the island is the home of a monstrous-sized python. Though the kindly caretaker tries to help the young people, will they all be able to survive?