If you're looking for manga similar to Isekai Kaeri no Ossan wa Shuumatsu Sekai de Musou Suru, you might like these titles.
Julius is a man who led an enormous uprising against the empire that resulted in over 1 million casualties... Having drifted onto an unknown island, it's apparent to him that there's something really strange about it. It turns out that two different worlds that violate the natural order of the universe have collided with each other, and created a land where magical beasts and sorcery clash against modern day military firepower and tactics!
Dungeons have been appearing in the world for the past few years. Hunters, the cornerstone of clearing dungeons, each have a job with its own traits and abilities. The one said to be the weakest among all of them is “Jobless”. It has neither traits nor abilities. That’s why it’s not even thought of as a proper job. However, Meguru rises to an S-rank hunter with that very job and challenges the Sky Dungeon, which is known as the greatest obstacle. He worked with other S-rank hunters and, the moment he thought he’d defeated the final boss… He was stabbed from behind.The other S-ranks had betrayed him. As he took his final breaths, his sister Kanna was also killed. He was reincarnated as a girl that looks exactly like Kanna. And like last time, his job was Jobless…With the knowledge of his past life and the future power of Jobless, Meguru will dominate everyone and everything.