Yuusha to Yobareta Nochi ni - Soshite Musou Otoko wa Kazoku wo Tsukuru - Vol. 1 Ch. 4 - Just a Couple in Name

[Grye]

There's dense and then there's the hero

 

[sgtmiles2008]

-Pretty much clueless about everything
-Super human strength
-Go help people because they need help
Yep, he's Saitama