Keiichi Maebara, Rena Ryuuguu, Mion Sonozaki, Satoko Houjou, and Rika Furude must go around town disguised in costumes as punishment for losing a fierce poker game. Keiichi persuades the party to visit Yagouchi, a desolate adjacent town, in order to avoid being spotted by additional people. Rena and Keiichi are piqued when Mion mentions a nearby abandoned quarry. Still, when she tells them more about the unexplained happenings that have occurred in the area, they discuss whether it is prudent to examine it.