Psychic Detective Yakumo was a mysterious investigator who specialized in investigating those seemingly unexplainable psychological problems. His investigations often allowed people to unconsciously discover their own psychological problems and take corresponding measures to solve them. In his investigation, he encountered many interesting characters and events, including a girl who loved to lie, a boy who liked to abuse animals, a girl who committed suicide because of childhood trauma, and so on. The investigation results of Bayun attracted the attention of many people, but there were also some people whose deaths were unknown. During the course of the investigation, he was also threatened and attacked, but he firmly protected the people he thought were worth protecting. In the end, he uncovered many unknown truths and found reasonable explanations and solutions for those victims. At the end of the story, Yakumo tells us that psychological problems do not exist in isolation but are closely related to the surrounding world. Only when we are aware of our psychological problems and seek help can we truly solve them and become stronger and more mature.