Being Happy in Another World? Impossible, I Absolutely Want to Go Back Home No Matter What

The protagonist is a 14-year-old Japanese who was born in the year 3181 AD and is just an ordinary junior high school student. One day, the story begins when he wakes up in a different world after being transported there. If he can master the power of nanomachines, he believes he can overcome any challenge and achieve his goal of returning to Earth someday.