20 years ago, "Talent Users" appeared in the world. Due to the mighty powers of Talent Users, the world’s power balance collapsed, and every large county fights in the "World Talent Great War". After the long war which lasted 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". Serizawa Atsushi 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.