Volume 13

"Monster Cells" (怪人細胞, Kaijin Saibō) is the thirteenth 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! A-Class heroes struggle in their fight against the giant monster Hundred-Eyes Octopus. Wait, is that S-Class hero Flashy Flash joining the fight?! Unfazed, the Monster Association continues ramping up its attacks, but its goal remains a mystery. Meanwhile, the martial arts tournament reaches the semifinals!

Trivia

 * Flashy Flash's face was redrawn in Chapter 68 to make his eyes less wide and wild-looking.
 * An extra double-page spread of Orochi in his throne room was included in the volume release.

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