To steal the twin Golden Lions told of in the clan of Nariyoshi Shiase, Lupin and Jigen head for Mongolia. The real objective is the map concealed in the statue, which will lead them to the buried treasure of Genghis Khan. meanwhile, Fujiko, in search of Minamoto Yoshitsune's treasure, meets up with Goemon at Hiraizumi, Iwate Prefecture, where he is visiting his ancestor's grave. The two threads are brought together at Ryuujinnuma "Dragon God Swamp", and where is the treasure...?