Just like the title, i would like a manga, (manhwa, webcomic, doesn't matter...), where males are rare or the male to female ratio is very unbalanced, (1-10... etc), doesn't have to be the entire world, (Like in Nagasarete Airantou...). 😀

"It's so much easier to see the world in black and white, gray?... i don't know what to do with gray." Garrus Vakarian - Mass Effect 2.

Theres an american comic called Y: the last man, it may be of interset
http://www.vertigocomics.com/graphic-novels/y-the-last-man-vol-1-unmanned

Seirei Tsukai no Kenbu (HYOUJU Issei) - male spirit contractor, all other contractors are female (ofc there are "normal males" but they almost never appear. Recommend the novel though)
IS - also only male in an all-girls school and more-female-dominated world (based on ongoing novel and anime got second season)
Dragons Rioting - another guy in all-girls but there are 2 other guys as well
Kenshin no Keishousha - also rather female-dominated society and i think in the school arent many males either (1 volume of novel is translated so far)...
Isekai no Seikishi Monogatari - males are not as many as females (dont know ratio. recommend the anime though, 13 episodes each 40+ min.)

1 love 9 - There's a ratio of 9 girls per boy in this one. Female dominated society where males get treated like crap.

Hachi Ichi?

All-girls schools:
Negima!
Yasashii Sekai no Tsukurikata
Sense (meh)

Maybe this category:
All girls school becomes integrated

Oooku - Set in an ancient Japan where nearly all males have died out. Explores the social and political consequences, a little gem.

So basically any harem manga ever.

Vandread was a classic, the anime at least.

What I like in Trivial Pursuit style. Pick your category:[img]http://i379.photobucket.com/albums/oo233/Reid4891/Manga/trivia-1.jpg[/img]

Also looking for this.. though Reverse. like less girls or something?

[img]http://i42.tinypic.com/t50h9d.jpg[/img]

The beautiful girls club

[img]http://i1298.photobucket.com/albums/ag59/psycho-shocker/x475_zps5899fdef.png[/img]

Open Sesame - High school Regional boxer leaves island for the Big city. new school is a former girls school that gone Coed. Only 5 or 6 boys in the school.

Nemureru Hoshi - Though it's not a case of men being rare, rather that all men, save for the MC, are asleep.

Interesting..

Thanks for all the suggestions, i'll try them now!

"It's so much easier to see the world in black and white, gray?... i don't know what to do with gray." Garrus Vakarian - Mass Effect 2.