Ponkotsu Outaishi no Mob Ane Oujorashii kedo, Akuyaku Reijou ga Kawaisou na no de Tasukeyou to OmoimasuPonkotsu Outaishi no Mob Ane Oujorashii kedo, Akuyaku Reijou ga Kawaisou na no de Tasukeyou to Omoimasu; 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

Lutia, the first princess of the Kingdom of Fatisia meets Alicia, the daughter of a marquess, who laments, "I never want to be a villainous daughter." In the future, she becomes engaged to Lyle, Lutia's half-brother, She sympathizes with Alicia, who confides in her that her future engagement to Lutia's half-brother Lyle will be broken off and she will be executed, She begins to try to avoid the death of her father, the king, and the epidemic that her own brother is suffering from! A 10-year struggle between a mob princess and a villainous daughter from an Otome game to open up the future!