Once upon a time, there was a man who believed in fairy tales. He married a beautiful, mysterious woman named Indigo. He was a student fascinated by myths; she was the heir to a great fortune. They believed they would live happily ever after. In exchange for her love, Indigo made him swear to never dig into her past. When Indigo finds out that her aunt is dying, she is forced to travel to her childhood home with her husband. The temptations to break the promise soon begin because in the dusty hallways of the decadent mansion lurks the shadow of a girl named Azure, Indigo's best friend who disappeared suddenly. As the house begins to reveal its secrets, the couple must choose between reality and fantasy, even if doing so puts their marriage and lives in danger.