Manga World: Bringing Steam Technology to the World of Sanctuary

After dying in a pandemic and not from the flu, a 37-year-old man is reborn with his memories of his past life and a knowledge of a technological branch of a not so popular RTS and survival game. And when he thought that his life was going on and his plans were being resolved step by step. He finds himself on a second trip the night before when he enters his new school. After living twice in a normal modern world, now I have to survive in a semi-apocalyptic world of Diablo? What! Are you telling me that my second world is not a normal modern world either? Destination what are you playing?!