Light novel series written by "Honda Tooru":http://ja.wikipedia.org/wiki/%E6%9C%AC%E7%94%B0%E9%80%8F and illustrated by [[Komone Ushio]].
Title: がく×ぶる
Official website: http://dash.shueisha.co.jp/-gakuburu/index.html
Japanese Wikipedia: http://ja.wikipedia.org/wiki/%E3%81%8C%E3%81%8F%C3%97%E3%81%B6%E3%82%8B
gaku buru