Rookie detective Tatsuya Sumire dreamed of being like the hot-blooded detectives who appear in detective dramas. However, the first order he gets from his superior is to infiltrate a programme as an idol in order to solve cases occurring in the entertainment industry. And so, the idol ‘Deka Dance’ is formed impromptu. Tatsuya is initially bewildered by the special world of the entertainment industry but somehow gets popular each time he solves a case. And then he gradually becomes aware of himself as an idol.