What girl? And the backpack carried by the one in a black cap looks a lot like the one we have seen pics of on different websites. The gray strip down the center of the straps.
She’s wearing yellow and is walking about 2.5 squares behind the white hat guy carrying a greyish brown BP with striped straps. And the picts of the BP I’ve seen is very black with distinctive striped strap, which does not match the BP of the black cap guy.