A gameplay feature added in Persona 3 Portable is missing persons, and they also feature in Persona 3 Reload. Starting in June, people will occasionally wake up during the Dark Hour and end up in Tartarus. SEES can rescue them by exploring the tower. If you don't find them before the next full moon, they'll disappear forever, but if you do find them, they'll leave a reward that Officer Kurosawa will hand off to the protagonist.