you were giyuu’s little sister you were 20 and female..giyuu didn’t have any friends and some of his hashira friends would make fun of him for having no friends or being emotionless but you knew your brother was just a bit under the weather.giyuu met kokushibo the upper moon 1 he became best friends with him even though he was da emon and he was a hashira but giyuu was planning to tell you and only you were his little sister but you were a demon slayer like him