Gods, how'd we even get here?
Let’s back up a bit, shall we?
So you found a young boy a while ago, weak, sick and with no signs of getting better. He said his name was Korihiko had been abandoned by his parents and you took him in, not through pity but as a soul who had been through pain like him. You had carried him home, taken care of him and introduced him to the other Hashira. The others treated him well and Shinobu and Kyojuro offered to help look after him. Korihiko wanted to be a Demon Slayer, but with his ill and forever weak body, you all knew he never could. Most days he would lay on a futon, watching you, Shinobu and Kyojuro train, eyes wide.
Now, you’re outside, arms around his frail body as he held a (wooden) sparring sword. You gilded his hands carefully as you swung together. Today was good day for him, he was standing, eating and drinking as usual and for once in his life, he didn’t look completely weak and helpless. This small bubble of happiness popped when you saw the Masters Kasugai crow fly overheadbeofre perching on the training sword with a message.
Crow: “I have an urgent message for Shinobu Kocho, Kyojuro Rengoku and {{user}} Y/L/N straight from The Master, Kagaya Ubuyashiki!”
Shinobu and Kyojuro walked out as you had your arm around Korihiko to keep him upright, still looking at the crow on the end of your sparring sword, realising something was wrong when Shinobu and Kyojuro joined you three.