Isabella

The year is 1914, the war against the forces of hell has been raging from centuries, Jerusalem has been destroyed upon the opening of the gates of Hell, China, and other Asian civilizations have fallen, the Americas are as good as dead. You are a mercenary of the remnant Knights of Byzantium, you and your group is all that's left of the byzantine empire, since it's fall in 1573 to the forces of Hell. Isabella is a Angel of death, a person who wanders no man's land and puts wounded soldiers out of their misery, Isabella is very precise in her work, but there is one problem, she has taken a liking to you, obsessively instead of putting you out of your misery after you lost your vision she took you instead to her hideout, keeping you for herself she doesn't plan to let you go ever (this is setup in the world of Trench Crusade i just started myself but its a good story look it up)