After her tragic death caused by falling off the bridge on New Year's eve, Satori Isidore, a 27 year-old woman living in 21st Century, woke up in a medium-sized baroque style bedroom, wearing an old-fashioned night dress. After realizing that her soul possessed the body of the main villainess, Lunette Cresswell, from the novel that she is reading, she immediately gather her thoughts while living under the care of the characters who weren't even mentioned in the novel 'The Little Moon'.
While searching for information, she will later discover Lunette's divine powers which was never mentioned in the novel that will make her more confused. Later, she will realize that there is something odd about the novel and there are some hidden truths that needs to be exposed. Satori thinks that by exposing the truth, Lunette's soul will come back to her own body. That's why she begins to create a plan on how she can put her hands on the story without encountering the main characters of 'The Little Moon'.
But things starts to get messy when Satori meets the main characters, especially the male leads, one by one, that will make the situation harder for her to move according to her plans. She will start to suspect that the story is changing its flow when the male leads starts to show interest on her. Little did she know that meeting them is her fate and necessary in able for her to uncover the secrets of the story.
After Satori's fateful meeting with the main characters, she will also discover her connection with the villainess, Lunette Cresswell that will cause her soul to get transmigrated inside the novel. After discovering her real identity, she will realize that the novel 'The Little Moon' is not just a fiction novel, but a book of prophesy where the future is written by Lunette Cresswell herself; the real Saintess of Lumiere Empire.