Kishi Danchou no Musuko wa Akuyaku Reijou wo Dekiai suru

"Alice, I'm breaking off my engagement to you!" are the words Echs, the son of the Knight Commander, remembers from his previous life. In the very place where the prince's engagement is about to be broken off, he remembers the exact same situation from his previous life in a dating sim game. Though clearly fale, the villainess is blamed together with another character. And when he saw the heroine sneakily smiling at him, he made up his mind. He wants to save his favorite villainess and make her his own. This is just a sweet story about a hero reincarnated as the son of a knight commander in a dating sim game who dotes on the villainess.

(Source: MangaPlaza)