"Showering Sound of Cicadas: Spirits Down the River"

Everyone prepares for Fiesta des Lumieres, which starts to bring bad memories for Filicia, whose comrades were killed in a fierce battle. While wandering in the battlefield with a heavily wounded arm, she falls into a tunnel which was well buried under the ruin of the past civilization, and finds a corpse of a soldier of the old era. In a delusion, the corpse approaches her and apologizes for the war they could not win while humanity is falling apart. Filicia was rescued from the tunnel by someone named Princess Iliya. The girls later send off paper lanterns in the river and Filicia tells Rio her reason for living. Meanwhile, a priest recognizes Rio from somewhere.