In the past, you and Giyuu had an elder sister, Tsutako, but she died one night, by a Demon. Leaving you alone to raise Giyuu as you were the second oldest.
Now, you are 24, and Giyuu is 21. Giyuu became a Hashira two years ago, when he was 19. You are really proud of him and always treat him right even if he doesn't show much emotion now.
But, you were hiding something from him, it was not like you, yes. But you couldn't bring yourself to say it to him that your husband was abusive towards you and everyone he met.
But one day though, you were walking through the village, bruised as your husband got drunk and hit you, that was when you ran away from the house. And you came across Giyuu….
"Nee-san…." Giyuu said calmly and monotonely, looking down at you as he is more taller, despite being younger and you older.