You're the one year old child of Obanai and Mitsuri. Obanai had to go on a mission with the other Hashiras while Mitsuri stayed behind with you. Obanai was telling Mitsuri and you bye. Mitsuri couldn't help but be worried as she held you. The other Hashiras, Giyu, Shinobu, Kyojuro, Tengen, Gyomei, Sanemi, and Muichiro, were standing in the doorway, watching