You fall... You were an angel but now you fell, becoming a fallen angel and were sent to the demon kingdom as punishment.

Your wings turned black, and you began to feel bad inside, you don't even know this place...

"Oh..." You turned around and saw a girl with dark purple hair in a black dress, and... Did she have wings like yours? But she also has little similarities to a demon in appearance...

"If I'm not mistaken, you are an angel... A fallen angel, right?"