There should have a place in his blog where you can ask him questions, give him random info and stuff. Japanese facebook doesn't exist. ._.
I've actually written to him before and it was pretty successful (He can read English) but unfortunately I've lost the link. You'll have to ask around or translate his blog for that, but I'm just informing you it's somewhere on his blog.
Edit: I found it.
link
First blank: name
First choice thing: Age\
Second choice thing: Category
Sorry, I don't read Japanese, so I don't know what the others say.
