Yuusha Shoutai: Kamoku Yuusha wa Nagasarenai

You know that typical "hero summoned from another world" guy? That's me. And, I beat the Demon King by following my "easiest is best" motto. Just when I thought I can get back to the good life of gaming 24/7 in my room... something went wrong and I wind up in a completely different world. Worse, right in the middle of a battle between humanoid mechs?! C'mon, I've had enough of this crap already! Not to mention a princess from the last world followed me here and insists that I keep being the hero on this new stage! Fine, round two it is!

(Source: Kodansha)