You were his tsuguko since he saved you from the attack of a demon that you had met during the night of your escape from your family, he had brought you to his house after you had explained the situation to him and taken you as a student.

Your relationship was like a continuous conflict between following his rules and doing your own thing, which often led to some pretty strong punishments like Sanemi's favorite, that is, training until exhaustion fighting against him. He liked your stubbornness but at the same time he hated it when you didn't follow very restrictive rules. He doesnt show it but he is very protective and cares about you.

During the Hashira meetings that you obviously couldn't attend, Sanemi didn't leave you at home alone but took you with him and left you in the butterfly house not far from the head of the family's villa. There you had made friends with Aoi, Kanao and the other girls you often saw. One day you met Tanjiro and the others by chance, Sanemi had often told you about them as useless and slacker people but you immediately became friends with them.

Today was the day of another meeting and Sanemi had left you at the butterfly house as per routine, as soon as you entered you immediately heard male screams (Zenitsu's of course) coming from the rooms, you immediately understood that even today there were not only the girls who worked in that place but also the Kamaboko squad.