Special one-shot! Drawn by One-Punch Man artist Yusuke Murata with story by Inukorosuke! A no-holds-barred fight between science and magic!

Onepunch-Man/Dangan Tenshi Fanclub crossover ad.

A one-shot from the artist of Eyeshield21, published in Shounen Jump 2009 #22-23 Hokazono Kai, a soldier amidst a nuclear war, was captured by the enemy during a rescue mission. As a captive, he was tortured and tested upon. When the research center is hit by a tsunami and he escapes with a pair of blasters for arms. Kai returns to the japanese military and uses the one-of-a-kind weapon in battle under the codename "Blust".

In this new action-comedy, everything about a young man named Saitama screams "AVERAGE," from his lifeless expression, to his bald head, to his unimpressive physique. However, this average-looking fellow doesn't have your average problem... He's actually a superhero that's looking for tough opponents! The problem is, every time he finds a promising candidate he beats the snot out of them in one punch. Can Saitama finally find an evil villain strong enough to challenge him? Follow Saitama through his hilarious romps as he searches for new bad guys to challenge!

Note: Nominated for the 7th annual Manga Taishou Award in 2014. Won the 2017 Sugoi Japan Award. The manga also was nominated for an Eisner Award in 2015 and a Harvey Award in 2016.