[If this were nearly anyone other than Prompto, odds are good that Togusa would ignore this or tell them to go take a long walk off a short pier. But Prompto is just so earnest. So okay.]

Hunh. That's weird. Hibiki says that he took this on the night of the 31st?
I can definitely go talk to him and look around the area.
I wouldn't be too worried though. There was an incident at the park at the end of last semester? Turned out to be some student film makers working on their final project.