What is that manga called?

Maybe this one
http://www.mangago.zone/read-manga/villainess_level_99_i_may_be_the_hidden_boss_but_i_m_not_the_demon_lord/

Or this
http://www.mangago.zone/read-manga/i_m_not_a_villainess_just_because_i_can_control_darkness_doesn_t_mean_i_m_a_bad_person/

Sadly not that one :(

Not that one either but thank you for looking :))

Reimei no arcana
I think its that. Not isekai btw

Oh wait she has red hair and is shamed for it tho. Black hair is for nobles i think. Idk if its that. She does have a brother who is protecting her tho

What is the plot of the manga?

Not the manga that I was searching but it also seems superrrr cool. Thank you for the recommendation!!

She is shamed and bullied because she has black hair. The other nobles disrespect her and call her a demon I think. Her nemesis is the perfekt girl with blond hair and everyone adores her. The fl brother is the only one that feels sorry for her and tells her that she should fight for herself. But she thinks it all useless and she would be seen as a villian witch. I dont remember more because I didnt read many chapters. I wanted to wait for more chapters, so that I can enjoy it at one go.

I know i am very late. Is it this one
http://www.mangago.zone/read-manga/actually_i_was_the_real_one/?9M1n

Sadly it isnt but this one is awesome too!