I'm pretty sure Kurama had nightmares about Karasu. I had nightmares about Karasu.
Dearest Shuichi
6. A Distant Star
Dearest Shuichi—
When you left, there was something in your eyes—some sort of longing, as if you were afraid to leave. Now I know why that is. Tonight I saw you for the first time in a week, and a different look has replaced that dread. Now your eyes are dark, and your face is shadowed. I don't know what happened to you last week, or whether I need to know. You seemed fine at dinner, and can obviously still beat me at Go, but now I can hear you moaning in your sleep. You're having nightmares. I want to wake you up and stop them, but if I do then you'll know I heard you and you'll be afraid—either of me or for me. I'm not sure which, but either way I don't want that. It's better to let you sleep, and hope they end on their own. Despite the changes you bring back, having you home changed the whole house. It's brighter now. It burns like a distant star, alone in space and living only to keep living.
Signed,
Your mother.
