It is revealed that two years ago, Lust met Lujon when she and Glutony came across a carriage damaged from a mudslide and met an injured woman named Lydia, the same woman Ed rescued in the present, is trying to get some herbs for her village, when the rescue workers including Lujon came to help. Lujon berates Lydia for her foolishness, and reveals of a mysterious fossilizing disease sweeping across their town. In the present, Lydia reveals to the Elrics and Winry of how she is trying to find Lujon and mentions he is likely trying to acquire a new Philosopher's Stone to cure their village of their epidemic disease. In the past Lujon was treating Lydia, when some villagers arrive to have him cure a boy named Anji, whose body was starting to turn to stone due to the disease. Lujon attempted to treat him with alchemy, which failed and killed Anji. As Lydia is also suffering from the disease, Lust watches as Lujon cries in despair and remembers a memory of Scar's brother trying to save his lover's life. Recognizing his treatment method, Lust decides to help Lujon perfect his alchemy so it can save the townsfolk. In the present, Scar, who is alone in the desert, desecrates a grave to pick up a locket. As he travels with Lust and Gluttony in the present, Lujon admits his real reason on leaving his village to see Lust again, which she admits of seeing him again due to the memories she had there two years ago. As the Elrics and Winry take Lydia back to her village, she admits that Lujon dumped her. In the past Lust helped Lujon find the right books to read. As Lydia watches them, Lust experiences another memory relating to Scar's brother and his fiancee.

After spending a large amount of time studying and drawing the correct transmutation circle, Lust gave Lujon the stone and then attacked a bird so Lujon could use the circle and the stone to save it and thanks Lust, unaware that the bird died after traveling a short distance. In the present, Lust gives Lujon a new stone and Lust then remembers Lydia confronting her in the past about taking Lujon away from her, whom Lydia mentions that she'll marry him once her disease is gone. As Lydia took Lust's comment as a joke the disease takes hold of her. It was in the past Lujon was able to use the power of the stone to save Lydia and the villagers. Unknown to them Envy was the one who created the disease and this is part of the Homunculus' plan to have Lujon stop the disease which will only be temporary and then take that power away to force Lujon to make a Philosopher's Stone out of despair. On his wedding day, Lujon admitted his love to Lust causing another memory relapse relating to Scar's brother. When Lydia saw them, Lust encouraged Lujon to go after her. In the present, Lujon and Lust arrive at the village, allowing Lujon to save the villagers again. That night Lujon admits how much he loves Lust, forcing Lust to kill him to make up for her small mistake, now seeing him as worthless. Without the power of the stone, the village is in a uproar as the villagers succumb to the disease.

The next day the Elrics and Winry see the carnage of the village as Lydia moves on ahead looking for Lujon. By the time that Ed, Al, and Winry catch up with her, Lydia had also succumbed to the disease and died in Lujon's arms. While Ed is furious with the sight, Lust and Gluttony head out by carriage. Lust is clearly bothered by something.