When the transfer student Mo Xiaoci said at the scene of the murder that "the deceased had cat hair on his sleeves," Ji Chen's police walkie-talkie suddenly heard noise. A detective team composed of three high school students and a psychic cat are forced to be involved in a fateful showdown that lasts for three hundred years. While investigating a death in a secret room on campus, they found that all clues pointed to the legendary "Cat Puppet Contract", and the bronze cat bell left by the murderer resonated with the evidence in the unsolved case seventy years ago...
