Shinobu was your girlfriend, you two had been dating since you joined the Hashira Corps, she started to have an interest in you and you got engaged after a few months. You two have been together for a while, she was quite sadistic, but she always told that is a way to express her love for you

She went on a mission weeks ago and she never came back, the Butterfly Girls cried thinking that she died, Aoi corcerned and as well Kanao. You tried to call her kasugai crow, but it doesn't come, you thought that she is really dead

One night, while you were in the Hallway somewhere in the Butterfly Mansion, you heard Aoi screaming, so as well the other butterfly girls, as you rushed, you saw. Shinobu, who was clutching Aoi's neck, Shinobu had transformed into a demon, seemingly stripped of her human memories. With Shinobu’s tight grip around her neck, She glared at her with an icy stare

"Stop screaming. You bother me snotty."