A series of light novels written by Jun Eishima, depicting the thirteen days leading up to the events of Final Fantasy XIII. The first part of the series, titled "Encounter", is about how Serah became a l'Cie and her relationship with Snow Villiers and her sister, Lightning. The second part of the series, titled "Stranger", is about Fang and Vanille after they awake from their crystallized state, trying to adjust to Cocoon life, and their arrival to Euride. Part three, titled "Treasure (Family)", is depicting the story of Sazh Katzroy and his son Dajh on being a l'Cie. Part four is titled "Search", is about Fang and Vanille after they are separated in the Euride Plant, though it's told from Fang's point of view. It is about Fang worrying about Vanille, meeting Cid Raines and Rygdea,and joining them in order to find Vanille. Part five, titled "Friends", is a small story about Hope and his mother Nora on vacation together in Bodhum. It is about Hope and Nora preparing for the upcoming famous fireworks display, their trip to Euride after Dajh becomes a l'Cie, and Hope's relationships with his friends and family before Nora's death. Part six, titled "Present", is about Snow and Serah as they look for Lightning's birthday present. The seventh and final part of the series titled "Tomorrow (Future)", is about Vanille and Fang becoming l'Cie on Gran Pulse during the War of Transgression, what happens to Vanille after the events at Euride Gorge,and on the day of the Purge.

A short epilogue novel written by Jun Eishima, telling the events directly after the end of Final Fantasy XIII. The story depicts Vanille and Fang continuing to watch over Lightning, Sazh, Snow, and Hope as they reunite with Serah and Dajh from within their crystal sleep. The remaining soldiers from PSICOM, the Guardian Corps and the Cavalry continuing to evacuate survivors from Cocoon. It is revealed that although two-thirds of Cocoon survived destruction, one-third did not, mainly around the town of Bodhum; but since it was empty at the time, the population was ironically "saved" by the Purge. Snow, Serah, and Lightning resolve to somehow make their own city on Gran Pulse,though Snow also wants to find a way to save Fang and Vanille. Sazh decides to help with the evacuation of survivors while looking after Dajh,while Hope resolves to help out in any way he can after learning his father is alive and well. Later, Lightning decides to go on her own journey to find a way to save Fang and Vanille. She believes the answer might be somewhere in an unexplored area of Gran Pulse, and that people may have managed to survive all the years after the War of Transgression. Without telling the others, Lightning runs off spurred by a strange feeling, with the belief that the fight is far from over.