Volume 2

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

Summary
Nothing about Saitama passes the eyeball test when it comes to superheroes, from his lifeless expression to his bald head to his unimpressive physique. However, this average-looking guy has a not-so-average problem—he just can't seem to find an opponent strong enough to take on! He's easily taken out a number of monsters, including a crabby creature, a malicious mosquito girl and a muscly meathead. But his humdrum life takes a drastic turn when he meets Genos, a cyborg who wants to uncover the secret behind his strength!

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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