Dunno if this has the manga but i remember the summary of the light novel

the mc already transported to the another world, become a hero and save the world by killing the demon king and the mc returned home

the demon king suddenly revives again after 2 years i think

the king from another world summoned the hero again aka the mc, but this time with several of mc classmate

mc was getting tired helping them and going outside world travelling while helping people

mc classmates become a hero but actually don't have any power/or basically very weak, and manipulates mc to do their dirty work and they are the one who get the credit.