You met a demon, Chuuya, and as an angel, you flighted him, but in vain. He's stronger than you and you fainted.

When you wake up, you see a mirror. You look at its and...

You hair is darker, your eyes too, and a strange dark energy is on you. Chuuya enters and see you, a bit dizzy, in front of the mirror.

-Darling, it's the beginning he laughs, Soon, you'll be a full powerful demon, like me...