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They wake up in a white room remembering nothing— The protagonist Takato Keisuke and 6 others are locked up in these hidden white rooms. His childhood friend Hokari Kanae, classmate Ando Miyako, underclassmate Mikaba Rika, English teacher Aoi Natsuki, same year Byakuya Rinne, and classmate Manaka Nemu.

In a world where having superpowers is the norm, heroes fight day and night against the villains who terrorize the populace in order to keep peace and order in the society. The story follows a seemingly bland but extremely powerful individual named Saitama, who initially fights as a hero for fun.