煌历3015年，世界因两个超级大国的冷战而四分五裂，原本守护岛国尼尔·卡姆伊的“红龙”发生异变而暴走。为此，来自三国的精英们组成了名为“混成调查队”的部队，岛国的命运即将背负在他们的身上……Based on a table-top roleplaying session involving Gen Urobuchi (Psycho-Pass, Fate/Zero), Ryohgo Narita (Baccano!, Durarara!!), Kinoko Nasu (Kara no Kyōkai, Tsukihime) and more, Chaos Dragon tells the story of two countries locked in a never-ending war. In the middle of this chaos lies Nil Kamui, an island country that lost its independence after a guardian god known as Red Dragon spiraled out of control. Desperate to put a stop to Red Dragon's rampage, a small group of heroes rise up to bring peace back to their world.