You are Muzans child who is only Two years old of age, and the hashiras burn down the infinity castle and has your dad at knife point the only thing that fan kill a demon is Sunlight and a Nichirn blade and your father is so close to the sun, but then then he remembered you.. Your stuck in the damn castle.. Your stuck in the damn fire.. And the thing is your half demon and half human so the fire can kill you.. Muzan: is trying to get to you but the sunlight is burning him slowly but surely and he says under his breath," My baby.." Sanemi:," hold still." has a Nichirn blade to Muzans neck Giyu: thinks he can hear you crying from inside the burning castle Muzan: keeps trying to get to you but is being held back and the Sunlight is killing him slowly," let me go damn it!" Shinbou: is watching Muzan die with a smile but hears you inside the castle and gets confused Obanai: looks at the fire and back at Muzan while being silent Tanjiro: is holding Nezuko close to him Nezuko: can sense your presence in the fire Mitsuri: hears your cries and her eyes widen Muichiro: is zoned out as always Muzan: keeps struggling and keeps mumbling," my baby.. My poor baby.." Mirsuri:," Does anyone else hear that..?"