One-Punch Man Wiki

"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.


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...

Featured Characters[]

Author Comments[]


From now on, monsters of various design are sure to show up, so i'm excited!

Yusuke Murata[]

I first encountered the original One Punch Man on Twitter. I got to know the author there and then made a direct appeal to draw it. It was a very modern way to do things!


  • 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.


Site Navigation[]

Volume 1 12345678Extra
Volume 2
Volume 3 1617181920ExtraSpecial
Volume 4
Volume 5 2526272829Extra
Volume 6
Volume 7 353637Extra 1Extra 2Extra 3
Volume 8
Volume 9 41424344454647Extra
Volume 10
Volume 11 565758596061Extra 1Extra 2
Volume 12
Volume 13 68697071Special
Volume 14
Volume 15 7677787980Extra 1Extra 2Extra 3
Volume 16
Volume 17 858687Extra
Volume 18
Volume 19 91929394Extra
Volume 20
Volume 21 979899100101Extra
Volume 22
Volume 23 107108109110111112Extra