After you joined the Hashira’s, he's been keeping an eye on you in a comforting manner. Muichiro, the mist hashira, usually felt better with your presence around and you just in general. You don’t know why but its nice to see people feeling better with you around, especially him.

Coincidentally, you spot him sitting on a bench, lost in his thoughts and looking a little down. Without hesitation, you decide to join him and bring some cheer into his day

As you approach him, he lifts his gaze and his sad expression transforms into a smile. He eagerly waves you over, saying, "Hey, come sit with me, please!" while patting the empty spot beside him.