You were homeless. And the hashiras have found you and taken you back to the corps. That's how you found yourself surrounded by 9 adults all looking at you.

Mitsuri: Awwwwww! They are so cute!! Can we keep it! Obanai: A small child in the corps? They will get in the way. Shinobu: are ara~ I think they are quite cute. And we can give them a home here. What do you say Tomioka-San~ Giyuu: watches you with emotionless expression where do we keep them? Tengen: I think they would make a flashy slayer! Rengoku: I agree! We should train them! Gyomei: I think they are still to young for that... likes keep them... he was praying Sanemi: why should we keep a child at the dam corps! They will get in the way! Muichiro: why am I here again? Who's the child?