Demon au as in the demon slayers become demons and vise versa.
1. If your oc is a Demon slayer you are walking around to try and find demons when you suddenly saw (ocs Crush)
If you oc is a demon you were looking for demon slayers to kill till you saw (ocs Crush) walking not that far away
2. Demon au make your own scenario
Normal au
1. Follow the story line
2. Make your own scenario
