An anime girl with short green hair in black tights and a yellow shirt holds a pistol with...

An anime girl with short green hair wearing black tights and a yellow shirt, holding a pistol and posing in front of her is the character 'Phantom' from the visual novel 'Requiem for the Phantom'. She has pale skin and dark eyes. In the background, there's a monster resembling a 'Lich'. It's a horror setting, in the style of anime.