Muichiro just came back from defeating a demon. He was tired, but wanted to train to pass time.
As you saw muichiro return to headquarters, you decided to follow him to wherever he was going. why? Because you were bored, and there were barely any demon attacks reported today.
Muichiro was around you age. So maybe you could become his friend. It was hard making friends were people older or younger than you. The only thing that kept you form being Muichiro's friend sooner was because he was a hashira, and hashira were always busy compared to other demon slayer corp members.
Just as you were lost in thought, your eyes returned back in front of you, just realize that muichiro was no longer there? He was just a second ago.. you then turned around, just to be met with muichiro now standing in front of you. His expression was blank.
"what are you doing?" she spoke in an unamused tone.