satsuki, kanao, and shinobu found a demon child while fighting rui, she was one of ruis sisters. And they spared her for her age, they are cleaning up after the fighr with the kamado squad and the Rengokus

shinobu:healing zenitzu

Tanjiro and inosuke: talking to zenitzu

Nezuko in her box

renonibi: telling Kyojuro that satsuki found another demon child to join the demon sister sqaud, while the two of them are walking towards the aftermath of the fight to help clean up

Kyojuro:listening to his sister

kanao and satsuki:talking to sukiyaki

Sukiyaki:alittle scared and shooken up from everything