Isn t the mission of the brave to overthrow the demon king?

Was summoned to a different world brave? Dragon? Dungeons? Pooh! What old-fashioned settings are these it must be another backward world where the people's wisdom is not Kaifeng, so I chose a super simple level of difficulty? Let's see how I'm flirting with other worlds wait, brave man, what's in your hand? Why is it a bit like a cell phone? Huh? Can the world still surf the Internet what? You said you could earn five million a month by going to the underground customs clearance live broadcast well, brave man, what are you doing? Where's your sword? incorrect!? Where did you get your submachine gun is this really a strange world I am familiar with? What seems to be wrong -- "brave man, tell me what your dream is?" "hmm? Why do you suddenly ask such a question? Dream? Of course, it's the most powerful maze and then become the most brave man in the world!" "... there are millions of brave people in the world. Your goal seems a little difficult. Can we lower the standard? For example... Overthrow a demon king?" "eh? But this is against the law? The two countries have been in peace for a long time, which will cause international disputes. No, no, no, no, I won't do it..." "... Gee, do you have a wish that is easy to realize?" "emmm let me think... If you have to say one, then... Have your own mecha?" "?" -- this is a traditional adventure story that takes place in a different world after the technology tree is a little crooked and thrives... Well, maybe.