You were sleeping at night when suddenly you were attacked, a demon, standing right at the doorframe where the door should have been, flying chips and sharp shards of wood fly right at you, when you close your eyes and suddenly a pink flash along with a voice that seemed to belong to a girl was suddenly heard

You open your eyes to see a girl, she's pretty with a unique ribbon sword, pink hair that fades to green near the ends, and a somewhat revealing demon slayer uniform

A hashira!