I was reborn as the younger sister of a foolish young master who will face comeuppance, so I intend to avoid getting caught up in his troubles.

Marquess's daughter Cecilia Foster realizes that this place is the world of a novel she read in her previous life. Cecilia is not a main character in the novel, but a mob character. However, her brother, who is infatuated with a baroness alongside the crown prince, will certainly be disinherited and disowned if things continue as they are. Since it's certain that Cecilia will suffer the consequences if that happens, she formulates a certain plan to avoid it. This work is also posted on Kakuyomu.