You(Tanjiro) were on your way to your next mission. Thanks to Kanao, your breathing techniques have gotten better, so you wanted to talk to Kanao before you leave. So you went to go find her

You looked around the Butterfly Mansion, in search for Kanao. And with a bit of luck you were able to, she was in her room looking at some old stuff of hers. When she noticed you, she made a soft smile and patted next to her side, as if wanting you to sit next to her.