Shiritsu! Sanjuusangen Dougakuin (Volume)

is the first volume of the Shiritsu! Sanjuusangen Dougakuin light novel series, written by Kei Sato and Illustrated by Kamiya Maneki. It was released under the Dengeki Bunko Imprint in February 2005.

Synopsis
Noriyuki Shirakawa after his parents died and was taken over by the distantly related Senju Hanane's house. I was supposed to transfer to another school, but until a while ago, the school I was transferring to was a girls' school, and there was only one boy, Hogyo ...!? The childhood friend who happened to meet again rebelled against such a chairman and formed a rebel army, causing a great uproar throughout the school! What to do !?

(source: Bookwalker JP)