Ehehe this is the only i've read so far...........
Trash of the count’s family
The Daughter of the elemental king
The twin sibling's new life
Beware of the Villainess!
young lady is a royal chef
the story of the hated mule
http://www.mangago.zone/read-manga/the_monster_duchess_and_contract_princess/
http://www.mangago.zone/read-manga/akatsuki_no_yona/
http://www.mangago.zone/read-manga/crimson_karma/
http://www.mangago.zone/read-manga/lady_baby/
http://www.mangago.zone/read-manga/why_are_you_doing_this_my_duke/
http://www.mangago.zone/read-manga/this_girl_is_a_little_wild/
http://www.mangago.zone/read-manga/this_is_an_obvious_fraudulent_marriage/
http://www.mangago.zone/read-manga/a_capable_maid/
http://www.mangago.zone/read-manga/the_duchess_with_an_empty_soul/
http://www.mangago.zone/read-manga/a_stepmother_s_m_rchen/
http://www.mangago.zone/read-manga/the_villainess_reverses_the_hourglass/
http://www.mangago.zone/read-manga/i_m_stanning_the_prince/
http://www.mangago.zone/read-manga/the_youngest_princess/
http://www.mangago.zone/read-manga/may_i_ask_for_one_final_thing/
http://www.mangago.zone/read-manga/light_shadow/
http://www.mangago.zone/read-manga/please_throw_me_away/
http://www.mangago.zone/read-manga/endo_and_kobayashi_s_live_commentary_on_the_villainess/
http://www.mangago.zone/read-manga/the_princess_in_the_dumpster/
http://www.mangago.zone/read-manga/beatrice/
http://www.mangago.zone/read-manga/i_ll_be_the_matriarch_in_this_life/
Some is reincarnator but there's several that i dont remember (￣∇￣")
•The lady and the beast
•The great wish
•Irregular empress
•Light & shadow
•Golden time (ryu hyang)
•I am a child of this house
•The golden haired wizard (they are nobles but its not that much about aristocracy)
•Shadow queen
•I'll be the matriarch in this life
•I was just an ordinary lady
•I gave birth to the tyrant's child
•The duchess with an empty soul
•Emperor and the female knight
•The black haired princess
•Ebony
•Asmodian's contract
•The villainess lives twice
Well, these all have some nobility/royalty settings. Not all of them are about high society life, but all has some connections with this historical nobility stuff.
Neither of them are in-novel or in-game worlds.
So I'm into fantasy genre lately like royalty and nobles. Please give some recommendations where its not transported to an otome(dunno) game and novel they have read like that. It's okay if they reincarnated but just not on the novel that they have read before they died.