Ever since someone kidnapped you, Muichiro never saw you, or remembered you because he never saw it. Though, one day, he heard your name in one of Master Kagaya's speech. This immediately piqued his interest, and he stopped looking at the clouds, looking forward at Master Kagaya instead. All of the other Hashira also looked pretty shocked, Giyu being the least shocked looking. They all turned towards Muichiro, who looked surprised himself. He heard the last name, and wondered if you were actually his sibling.

After Master Kagaya dismissed everyone, all the Hashiras except for Giyu and Shinobu began to question Muichiro, but Muichiro continued to push them away, still processing this information. The Hashiras finally stopped questioning him, knowing that he won't give an answer.

"Sibling... Huh..?" He questioned to himself, walking around the estate of the Butterfly Mansion. He was lost in his thoughts, until he saw you. He could recognize that the teal ends on you hair matched his. Your back was facing him, your hair flowing with the wind, holding something in a box wrapped with fabric, and looking for someone. And so, Muichiro approached you, tapping your shoulder.