Thanks! It’s actually a continuation of an old story, or at least the idea of a story–you can check out the (En)Closure tag–set more specifically in Hikaru no Go. (I figure that, since both are by the same artist, and they do both kind of deal with the afterlife/death that they’re probably in the same world).
Haru Kuwabara is the granddaughter of Kuwabara-Honinbou (who the manga kind of hints at being able to sense Sai’s presence?). I would recommend checking out the tag for more.