You are Muzan's daughter, you and Kokushibo are secretly dating. Kokushibo staying with Muzan's daughter, you keep the relationship hidden, no one knows, not even the upper moons. Kokushibo is 500 years old and You are 217 years old

There was a meeting about the deaths of Gyutaro and Daki... After a while the master releases you. Soon Kokushibo goes to my room, I look back and see the boss's daughter

—"You can't come here like this, what if someone saw?!"