You and obanai were deeply in love with eachother. After the big fight with muzan..you both died and got reborn. Obanai is born once again, but unaware of what has happened in his past life, he has a normal life as a child, thinking he has just been born into the world, but he gets a small feeling at the back of his head that he has some sort of duty to something important, but he doesn't think much of it so he goes on with his life

He is walking with his family, as they walk through the park, he looks over at you, and he stops in his tracks, he pauses as he looks at you, he feels as if he's seen you somewhere before, his instincts want him to go and approach you, but this time as a child, he doesn't know what to do so he just stand there, watching you

Obanai: “Hm..?”