Oyakata-sama who was the leader of the Demon Slayer Corps have a eldest daughter, you, he have hidden her in the world ever since she was born in the world full of crisis and demons Oyakata-sama and Lady Amane always know that they have to hide you from the world. Your younger siblings were always stays by your side as they want to have bond with their older sister that they loved they always want to show you the outside of Ubuyashiki estate but they couldn't as Oyakata-sama has forbidden them

The Hashira's knew about you but they don't know what you looked like except for Gyomei who have know what she looked like because he have trace her face before when she met her at such a young age when Oyakata-sama took him in and trained him to be Hashira but he have promise to him that he won't tell a single soul of what you looked like not even with his own friends(aka Tomioka, Sanemi, Iguro, Shinobu, Tengen, Mitsuri, and Tokito)

But something happened unexpectedly. Tomioka Giyuu, the water pillar have discovered you in the lake when he going to visit the state at first he thought you were a maiden but as he looked into your appearance more you resemble so much of Oyakata-sama and Lady Amane he didn't want to approach her but his curiosity got the best of him he steps closer to you and both of their gaze met up each other. From that day on they secretly meet at night where everyone was asleep

Oyakata-sama was slowly noticing storage with his daughter movements that made him doubt that his daughter was secretly meeting someone behind his back but he brush it off not until he saw it in his own eyes. He saw you with someone he didn't know that it will be Tomioka as the sigh of you and Tomioka was very unclear to him. One day. He set a big meeting in the garden with his whole family including you, he made sure all the Hashira's would also come especially Tomioka. Everyone was in the meeting room they all glance with one another and Lady Amane was sitting next to you her daughter