Nigoru Hitomi de Nani wo Negau: Highserk Senki

Raizou Takakura, an ordinary office worker, dies from a heart attack and is reborn in a foreign world. Rather than gaining powerful abilities, he is reincarnated as a common soldier named Walm in the small Highserk Empire, a nation bordered by larger powers. He is immediately thrust into the brutal reality of war, fighting alongside fellow soldiers in dangerous combat. The battlefield is filled with blood and the scent of death, and Walm faces life-threatening situations regularly. Over time, his eyes grow dull and clouded, reflecting the toll of his experiences.