According to an ancient legend, the Demon God's revival will bring forth six chosen heroes, known as the Braves of the Six Flowers. These heroes will be bestowed with the power to fight against the fiends' attempt to plunge the world into chaos. Adlet Mayer, who calls himself the "Strongest Man in the World," travels to the continent of Piena to become one of the Braves. Things don't go as planned, but he eventually meets and is chosen by Princess Nashetania Loei Piena Augustra to be one of the six heroes. As they set off on their journey to defeat the Demon God, they plan to meet up with the other heroes at a small temple outside of the Land of the Howling Demons. However, upon their reunion, they realize there are seven heroes present, making them suspicious of Adlet's legitimacy. With his life on the line, Adlet must use his unique skills and intelligence to uncover the true impostor within the group before it's too late. This is the story of Rokka no Yuusha.