It all began when Crystalle Maurienne Elizabeth Cullen's family was massacred by a group known as "Black Butterfly," and she was the only one to survive when a perilous being from a parallel universe recognized as "Devian Xenon" saved her by making a contract with her, in exchange for which Crystalle had to give him her soul. She made a promise to herself that she would avenge their deaths and pursue the black butterfly organization no matter what happened, even if it meant doing so in the depths of hell, and ever since then, her life has been turned upside down, especially since she became the leader of the phantom's knight that her father left to her when he passed away. But as she draws closer to obtaining the justice she seeks, she also gradually reveals the darkest secrets her family is hiding— a mysterious secrets that might change her life. A/N: This is a work of fiction. Names, characters, businesses, places, events, locales, and incidents are either the products of the author’s imagination or used in a fictitious manner. Any resemblance to actual persons, living or dead, or actual events is purely coincidental.