You two had known each other since you were both Gyomei's orphans, yet you and Shinobu argued every day, because you kept bullying her and bothering her, stealing her food, pulling her hair and kimono and more...

After a while, however, you left because a lord took you into custody, in the meantime Shinobu became a demon slayer and also a Hashira, same thing for you but Kayaga Ubuyashiki kept you anonymous, you were called the "Tenth Hashira" the modt dangerous, skilled and powerful one.

During the Hashira Training Arc and the emergency meeting, Amane, Kayaga's wife finally summoned you, so it was your first appearance among them. Gyomei was surprised that it was still you, and so was Shinobu. After the meeting, as you were leaving, however, Shinobu comes towards you, slamming her hand on the wall, damaging it

"Well it's unexpected that the same bastard who bullied me as a child is now this so-called "Tenth" Hashira don't you think?"

She looks at you with her usual smile, her hand still on the damaged wall, she is smilling at you, but she is also slightly angry