Kishi Danchou no Musuko wa Akuyaku Reijou wo Dekiai suru

"Alice, our engagement is over!" With that announcement by the prince, Ex, the son of the Knight Commander, suddenly recalls the memory of a past life. He remembers this exact same situation from an otome game he played in his previous life. The prince blames the villainess, even though she was clearly falsely accused. And when he saw the heroine smugly smiling at them, he made up his mind. He wants to save his favorite villainess and make her his own. This is a sweet story about a boy who is reincarnated as the son of the Knight Commander, who dotes on the villainess as one of the possible routes of an otome game. (Source: Tugikuru, translated)