Hirai Taro (Hamada Gaku)―who would later become the famed mystery writer Edogawa Rampo―is an unknown author enamored of foreign mystery writers. He becomes captivated by the legendary detective Shirai Saburo (Kusakari Masao), and the two embark on a journey into the world of detectives. Taro gets entangled in a complicated case by a host of eccentric individuals, including Sumeragi (Onoe Kikunosuke), the charming trader; Mimako (Matsumoto Wakana), the enchanting proprietress of a secret club; and Junji (Morimoto Shintaro), the disdainful newspaper reporter.