Looking for a yuri manga

[BRabbit424]

I'm looking for the title of a yuri manga; I lost track of it with the shutdown of TMO. The protagonist is summoned into the world of an otome game (if I remember correctly) by the villainess (a very classist noble) and decides to become her assistant; eventually, she also makes the game's heroine fall in love with her. I remember that the villainess's last name was Tenebrae or something like that. Thanks in advance

 

[Litreara]

Genkai OL-san wa Akuyaku Reijou-sama ni Tsukaetai

 

[BRabbit424]

Genkai OL-san wa Akuyaku Reijou-sama ni Tsukaetai

Thank you very much