Volume 4

"Giant Meteor" (巨大隕石, Kyodai Inseki) is the fourth 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! Saitama is now a certified hero! And with that title comes great responsibility—he's required to perform one heroic deed per week. While Saitama makes the rounds to meet his quota, an incoming threat from outer space is screeching toward Earth...

Trivia

 * Black Sperm makes a cameo as an ice shaver in this volume.
 * The original version of Chapter 21 featured several full-color pages and flipbook animations. These were all removed in the volume release due to printing limitations, making the color pages black-and-white and condensing the animations into fewer panels.
 * Stinger's original design - wearing a vest and belt - was redrawn to be consistent with his updated design. His fight with the Seafolk was also shortened.
 * Errors remain on pages 20 and 21 of Chapter 23 which show Stinger with his old design's shoulder pads.
 * An error in Chapter 22 where Saitama appeared shirtless in several panels was fixed.

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