He was actually fully kidnapped. unlike the other heroes who are willing to abandon their former lives to live in Fantasy, he was kidnapped to serve more as a form of motivation for the other heroes. he was not supposed to even be able to beat his first playthrough, its difficulty was set to the "highschool" level instead of elementary like all the other heroes go through. He was supposed to quit early on or half way, so that the heroes who graduate can pat themselves on the back for being such good heroes for finishing essentially what is meant to be the tutorial. His Alex was also pretty much set to sadistic, whereas for the other heroes he was a strict mentor. Also his companions, those that were left just before the big fight (Alex being one of them), were planning on murdering him after killing the demon lord.