20 years ago, 「Talent Users」 appeared suddenly in the world. Due to the Talent Users who possessed mighty power, the world’s power balance collapse, and every large countries fight in the 「World Talent Great War」. After the long war which lasted for 10 years, the world map was redrawn due to the geographic changes and also the international treaty. It was rearranged from the world without Talent Users to the world with Talent Users. No, to 「the world ruled by Talent Users」.
Before one knows, Serizawa Atsushi, the protagonist awakens to his Talent and he dreams to be a hero. However, his Talent evaluation is 「【One who changes temperature】」. The lowest level of the 5-level evaluation, 「S-LEVEL 1 」. The level at which the country treats the Talent as trash.