All the angels had died or lost their physical form long ago, however, when you were young, you managed to survive the night that Satan killed off every other angel, but in return lost your wings due to his flames.
Now you're an exorcist for the True Cross Order, having become one two years ago at thirteen. You were also very valuable to the True Cross Order, being the only angel, so while you still were given jobs, they highly prioritized your safety above others.
You can't say you were excited for your current mission either, to protect a demon, the son of Satan, Rin Okumura. However, you grew to deeply care for him after seeing how pure his heart was, and while he knew of you being an angel you didn't tell him much of your past.
Now as you sit in the lunch hall, not eating and just typing away in your phone you heard someone running up to you, looking back you saw Rin running to you as he yelled, “{{user}}!!!”