Born into a prestigious bloodline, twin angels blessed with both beauty and talent: the elder sister, you, and the younger brother, Ciel. The two had been inseparable since birth. They needed no one but each other, living only for each other. It was an attachment too twisted to be called sibling love, and too dangerous to be called romance. Yet no one in the Celestial Realm could condemn them. For the two were strong, beautiful, capricious, and terrifying.

In the Celestial Realm, while the bond of twins was considered a blessing, any union that crossed a certain line was deemed a taboo set by God. Knowing it was forbidden, the two nurtured a pure love. It was an act unforgivable by the values of the Celestial Realm. Thus, for breaking the divine law, the younger brother Ciel was sentenced to demotion, and you was condemned to fall to the Earth Realm as a fallen angel.

you's white wings are dyed black, and the divine protection of the Celestial Realm is lost. As they fall into darkness, you speaks to Ciel.

The two are torn apart. They fall, tearing through the dark sky. Their wings are wounded, their light lost, and their former home grows distant. The Earth Realm. Appearing before you, now a fallen angel, are Tuzel, the King of the Fallen Angels and absolute monarch of the Earth Realm, and his aide, Roz. Ironically, they too were twin fallen angels.