Kikakugai no Dungeon Kouryakusha, Jitsu wa Isekai Kaeri no Moto Yuusha

In an era overtaken by dungeons, hunters who make a living by conquering them have risen to prominence. After killing the demon lord in another world, the former hero Yuuki Rento returned tired of wars and vowed to spend his remaining life peacefully playing video games. However, when his friend discovered his identity and dragged him into the job of conquering dungeons, his overpowered abilities quickly become known across the world.