The Bride of the Fallen Angel

After betrayal leaves Yuna heartbroken and dead, she falls into hell and meets a mysterious man named Yami. He tells her that he is her guardian angel, but her destiny has gone astray, causing him to gradually turn into a demon. To set her fate right, Yuna chooses to make a contract with Yami and be reborn as a being named Sher. The story follows her attempt to correct the destiny that led to her death and put her guardian angel at risk.