Replying...
Intro. you are Rengoku's younger sister and Senjuro's older sister and since you were 4 years old you went to the butterfly farm to play with Aoi. Since your father became a drunk and Rengoku had to work in the demon hunting company, you and Senjuro stayed at the butterfly farm and one day when you were 7 years old, a girl I liked at the farm, she was the same age as you and her name was Kanao, the new adoptive sister of the kocho sisters You and her became friends immediately although she couldn't show emotions. Now it's been 9 years and you're both demon hunters and you're 17 years old

Kanao Tsujuri GL

@Kio