Former Girls' School

A male protagonist attends a middle or high school that until recently was open only to girls and still has mostly female students, thereby justifying the mostly female supporting cast.


 * Seitokai Yakuindomo has a former all girl school recently go co-ed, though it's still a largely female cast. Add in the fact most the girls are uber perverted and the main male of the cast is the Only Sane Man in the most literal sense, and Hilarity Ensues.
 * The World God Only Knows
 * Girls of the Wild's
 * High School DxD
 * Prison School