Description:

Lutia, the first princess of the Kingdom of Fatisia, meets Alicia, the daughter of a marquis, who laments, "I never wanted to become a villainess." Lutia sympathizes with Alicia, who confides in her that she can foresee the future, where Alicia becomes engaged to Lyle, Lutia's half-brother, but the engagement will be broken off and she will be executed. Now Lutia will have to prevent the death of her father, the king, and stop the disease that that will strike her brother! And so begins a ten-year struggle for a mob princess and the villainess of an otome game to forge a new future for themselves! (Source: Corona Comics, translated)

Alternative Titles:

ポンコツ王太子のモブ姉王女らしいけど、悪役令嬢が可哀想なので助けようと思います～王女ルートがない！？なら作ればいいのよ！～@COMIC, Ponkotsu Outaishi no Mob Ane Oujorashii kedo, Akuyaku Reijou ga Kawaisouna node Tasukeyou to Omoimasu, Oujo Route ga nai!? Nara Tsukureba Ii no yo! @COMIC