DJ Peacock`s TV variety program, Countdown Television, receives advance notice that Joker is going to come to steal a treasure, The Scorpion`s Cup, live on the air. To help catch Joker, Peacock brings on the genius high school detective, Hayami Kyotaro. But when Joker is struck with a fatal poison planted in the treasure`s display case, he has only thirty minutes to live! Will Joker give up on the treasure? And who will triumph in the battle between detective and phantom thief?!