I want a female mc with gender bender genre, i also hope for manga that her disguise is not half heartedly like some of manga i know, at least at the level of manga hana no kishi haha..
Have you ever heard of 1/2 Prince? It's my favorite gender bender, personally, with action, adventure, and comedy being the main tags. It's not a slice of life like Hana Kimi and OHSHC, so it might not be what you're looking for, but you can't get a more thoroughly disguised female lead than giving her a male (avatar) body, and I love her quite a lot.
Hanazakari no kimitachi e? It's been a long time so i kinda forgot, but mc cross dress and went to all boys school and managed to kept her gender secret for a long time (ml found out pretty early or halfway through the story i think)
Mangas girls disguised as boys: Saver by Lee Eun-young Love in the mask by yu-rang han Yeonmo by so young lee Nononono by Lynn okamoto Shut hell by yuu itou