Help me please

I found this on rednotes, but I couldn't find the translated title on this site or maybe bcs it has a different name. I don't think this is an accurate description, but please bear with me.

So this character has black hair, and he's possessed by a ghost/god. When he was a kid, he was brought to (i think orphanage) to find a kid to be sacrificed (i think). Then black hair chose a light brown hair kid and brought him home. After that, black hair really took care of brown hair well. In the panel, I saw the black hair kid and the light brown hair kid are reading a book together.