Volume 2

"The Key to His Power" (強さの秘訣, Tsuyosa no Hiketsu) is the second volume of the One-Punch Man manga series.

Summary
A single man arose to face the evil threatening humankind.

His name was Saitama. He became a hero for fun. Three years of special training made him lose his hair, but he gained invincible power. He achieved such strength that he can defeat any opponent, however strong, with one punch. Unable to make use of his full strength, he is unsatisfied as a hero, but a cyborg named Genos asked to become his pupil! Then the House of Evolution takes an interest in Saitama's power and sends monstrous assassins after him...

Trivia

 * The page of Zeniru's home being defamed by the Paradisers was redrawn to include an easter egg of King reacting to the impact.
 * The original Chapter 15 featured a ten-page flipbook animation, consisting of Speed-o'-Sound Sonic leaping around Saitama at high speeds. This was condensed into a single-page drawing in Volume 2.

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Tome 2