Tanya, Aqua, Emilia, and Albedo from Isekai Quartet HD Wallpaper

Four anime girls are sitting together. The girl on the left wears a green military uniform and drinks from a carton. The girl next to her wears a blue outfit and holds a green bottle. The third girl has purple hair and wears a white dress, holding a drink. The girl on the right has long black hair, horns, and wears a white dress.