A Boxing Club Member is Reincarnated in Another World ~What's with These Guys? Don't They Train Enough? I'll Whip Them Into Shape~

I was a member of the boxing club at a certain high school, and I died after being hit by a truck on my way home from club activities. God reincarnated me, but the world I was reincarnated into was a fantasy world with magic. However, in that world, magic had become so widespread that no one engaged in physical labor anymore. Moreover, humans and demons were at war in that world, and apparently the Demon King would destroy the world in a year, so I was asked by God to set out on a journey to defeat the Demon King. "One jab and they're incapacitated!? Why are they so weak!? I don't understand it. I'll train them properly!" This is the story of a boxing boy who was reincarnated into a fantasy world by chance, subduing the Demon King through sheer physical strength――. The story has been completed. It has been posted on Novel Updates and Kakuyomu. The epilogue has also been completed.