[Doumeki is silent, listening closely, but its clear when Kazma mentions Kazuma's grandmother that sympathizes greatly.]

He told Kimihiro... "it wasn't supposed to happen". But he didn't say anything more than that...

[he's quiet for another moment, sighing and sitting back in his chair, propping a leg up on his knee]

I understand how helpless some one that age can feel when an older loved one has passed. I lost my grandfather when I was ten. Not much younger than Kazuma-kun. Even if there was something that could have been done, it's unlikely it could have been done by a child.