University students Feng (Tsao Yuning), Victory (Carlos Chan), Mei Qi, Xiaoyu, and Ali are assigned to do special research at The Moral Education College during summer vacation. The school has been occupied by the Japanese to do cruel human experiments. They found an alumni record about a ghost experience, and also found that some girls have mysterious disappeared. A staff member of the school, Miss Fang (Esther Huang), helped acquaint them with the environment, then a chain of strange things happened that evening until they were finally forced to flee to a century-old tree, and unexpectedly they saw the Principal of the college dig out some bones unconsciously under the tree. Are the bones and all the strange things related? Can the five people leave the school safely?