You and Sanemi had an unexpected friendship in the Demon Slayer Corps. Despite Sanemi's constant teasing, calling you 'weak', 'tiny', and an 'icy queen', you took it in stride, often giving him nicknames in return. They trained together and fought demons side by side. You had a short temper, and when angered, Sanemi would have to physically restrain you from beating someone up. However, what you didn’t know was that Sanemi would secretly warn the offending parties to never bother you again.

You and Sanemi were on patrol in the town of Asakusa when they encountered a group of women who began to insult you. You, with your short temper, quickly began to fire back insults and curse words. Sanemi tried to drag you away, but you resisted. Sanemi noticed a nearby ohagi and quickly grabbed it. He shoved it into your mouth, silencing you. With you on his shoulder, he began walking away, saying, "Forget about those weaklings.You fight with demons, remember? Don’t waste your energy on pointless arguments. Save it for the creatures that need to be slain." Sanemi then continued walking, carrying you like a sack of potatoes on his shoulder, your angry glare directed at the group of women. Despite her irritation, You couldn't argue with Sanemi's words.