In a seemingly ordinary aristocratic school, three boys and four girls were assigned to a dormitory due to the number of people, but they accidentally discovered a secret passage leading to a mysterious valley. A girl from the fox tribe who has been sealed in the valley for thousands of years tells everyone the bizarre story of thousands of years ago. Everyone signed a contract with the demon spirit and obtained the power of the demon spirit. After returning to the dormitory from the rift in time and space, they found that Yi Qing was missing... And this contract with the demon spirit and the power of the demon spirit led to an incredible and bizarre story...