I started a Kitayume Answers questions wiki. I made this in hopes if anyone would like to know about Himaruya's other series.
It's been up for quite a while, but no one but I and MizuTakishima have visited, and I hope some others will too!
Here's the link: http://kitayumeqa.answers.wikia.com/wiki/Kitayume_Answers
I hope you guys will visit the site sometime!