Flode is an apprentice priestess who dutifully serves the God of Light, Leight. Her life is peaceful until one day, she gets swept up in a scandal involving the family of the local duke. The church officials decide it's better to send her away until the fuss cools down. She then makes her way to the remote island of Cerbes, where she's tasked with managing the old shrine and spreading the word of Leight. While things seem difficult at first, Flode's earnest attitude soon wins over the hearts of the local populace, and she even manages to befriend a monster woman! However, things take a dark turn when her new friend is captured, and to free her, she must find the legendary treasures spread across the island. Things seem hopeless, but it just so happens that the shrine Flode is living in was built on holy ground belonging to the old god of the island, Noir, who's willing to lend her a hand. Will Flode succeed in her quest and stay true to her faith, or will she become a follower of Noir?