Waking up in a strange land, Lona was taken in by a woman named Erris. Three months later, there's a knock on the door, and Lona has to go to town alone. There, she gets into trouble with a shady knight only to be saved by a mysterious woman named Vese. It is then Lona learns that this strange land is called purgatory, and her memories are scattered around the world. Will she recover her memories? And even if she does, what will she do afterwards?