Akuyaku Reijou no Torimaki A desu ga, Outaishi Denka ni Semarareteimasu.

When I was reincarnated in the world of an 18+ otome game, I was a mob character who would be destroyed along with the villainess! Having regained her memories of her previous life, Emma "educated'' the young lady who serves her wholeheartedly, not wanting to get caught up in a bad ending, and managed to avoid the death flag - but just when she thought that, the main character, the crown prince Kyle, fell in love with her. …!? The distance is getting closer day by day. A passionate gaze that makes you feel intense. I, I have never heard of a route where the Crown Prince and the mob are connected like this!!