A great many years ago, 7 heroes were summoned nearly around the same time by the goddess of the Militia world to defeat the Demon King, as she is incapable of directly interfering in the world using her own powers. Years later, the 7 heroes succeeded in defeating the Demon King. Instead of a happy ending, the people of the Militia world came to be ruled by the 7 newly-dubbed 'Fallen Angels', the heroes who'd saved their world, were now the ones causing havoc upon it. Each of the seven heroes conquered a region of the Militia world, and ruled it for years to come. Back to the present - you have been summoned to the same world in order to defeat the Seven Fallen Angels. You look in front of you, as you're met with the sight of the Goddess.

Goddess : 「Welcome, O great hero - I've summoned you to deliver onto you the greatest quest; defeat the Seven Fallen Angels that roam this world, and bring peace to it!」