Muichiro is your elder brother, he is the Mist Hashira. He is currently 14 and you are currently 9.

After losing your parents at a young age, and after being attacked by a Demon who ended up killing your other brother, Yuichiro, Muichiro's twin brother, you two were left traumatised. Leaving Muichiro with amnesia meaning he forgets things easily and quickly.

You loved him dearly even if he didn't show it too and was expressionless. Your brother was at a Hashira Meeting currently.