This is a set of four books from the Joker Game series! They were originally published by Kadokawa Bunko. In 2008, the series ranked 2nd in "This Mystery is Amazing!" and 3rd in the Weekly Bunshun Mystery Best 10. In 2009, it won the 30th Yoshikawa Eiji Literary Newcomer Award and the 62nd Mystery Writers of Japan Award. As of February 2021, the series has exceeded 1.3 million copies in cumulative circulation, making it a popular work (*^^*) The synopsis is as follows: There is a group known as the "D Agency," a spy training school. Within it are 12 elite individuals with extraordinary abilities. Furthermore, there is a charismatic figure, Lieutenant Colonel Yuuki, who leads them and possesses a devilish charm. This work depicts their masterpiece of spy mystery! I got hooked and read them all at once! I really want those who are interested to read them too(^^) - Joker Game - Double Joker - Paradise Lost - Last Waltz - Author: Koji Yanagi - Publisher: Kadokawa Shoten