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?!