Chiyahoya Shite Yo! - oneshot art and story by Sumire Momoi
Meguru is living her dreamy life in Hoshikuzu Private Academy with population of 99.9% hot boys and 0.01% girl. With the exception of Ouran, reverse harem titles doesn't blatantly mention that they're indeed a reverse harem and acts innocently oblivious with the set up. Not only does this manga breaks the unspoken rule, it also glorifies it like a rabid fangirl like us would in real life. This oneshot is spot on with what we have been dreaming.
On a side note, I think I'm partial to all-boys school device. You see, I studied at an all-girls school from elementary until highschool. And then there's this nearby all-boys highschool. Very Hana Kimi right??? But after I left for college, the all-boys school started accepting female students! See it does happen in real life. Anyway, all's well ends well as I eventually married my husband who's actually from that all-boys school.