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One morning, as office worker Kobayashi gets ready for another day at work, she is greeted by a terrifying sight—the head of a large dragon staring into her eyes from across the balcony. The dragon immediately transforms into a cute, busty and energetic young girl in a maid outfit, who introduces herself as Tohru.

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.