Akuyaku Reijou no Dere wa Ore Dake ni Bareteiru

Reincarnated as the first prince of an otome game, the protagonist draws upon memories from his past life to recognize that the so-called villainess is not truly wicked but merely a victim of misfortune. Although he previously scoured every available source for a route where she could be saved and ultimately gave up after finding none, he is now resolute in his determination to change her fate and grant her salvation.