Akujo Kyousei Keikaku

A wizard named Arvel is killed by his fiancée, Seraphina, who later becomes the emperor's mistress and a well-known villain. After dying, he awakens in his 13-year-old body, giving him a second chance at life. He encounters a younger, innocent Seraphina and resolves to guide her into becoming a proper lady while also ensuring his own survival. His first goal is to prevent the death of his brother, Shou, who was previously engaged to Seraphina. However, he must navigate challenges such as Seraphina's indifferent family, other suitors interested in her, and a complex network of conflicting schemes. The question remains whether Arvel can change Seraphina's future and stop her from becoming a villain.