Marugoto Anju Gakuen

Kaguya is a boy in an all-girl's school for demons [fox spirits, succubi, werewolves, etc.]. He may not be the only human there (there are daughters of demon hunters attending from time to time), but this is still an all-girl school. And his attempts to conceal his gender lead to silly and unbelievable (yet deliciously enviable) situations.