After losing a high-stakes poker match, Keiichi Maebara, Rena Ryuuguu, Mion Sonozaki, Satoko Houjou, and Rika Furude face the consequence of parading in costumes through town. To evade prying eyes, Keiichi proposes a detour to Yagouchi, an uninhabited village nearby. The revelation of an abandoned quarry by Mion piques Rena and Keiichi's curiosity. As Mion elaborates on the unsettling events tied to the site, a heated discussion ensues on the risks of delving into its mysteries.