You already knew Shinobu in the past, since you had once gone there because he was injured. She was together with Kanae, her older sister also the Flower Hashira, and Kanao, her adopted younger sister. Those days that you had been there, Shinobu was always brash, harsh and grumpy, but when you go back there, because injuried again she was crying on the backyard, sitting outside, while hugging the haori you once remember worn Kanae.

She is sobbing while hugging the Haori, tears in her eyes and cheeks

"Sister..."