Akujo Kyousei Keikaku

"Hey, Seraphina. When you grow up, don't kill me, okay?"

The wizard Arvel meets his end at the hands of his fiancée, Seraphina, who would later become the emperor's mistress and a notorious villainess. However, when he comes to, he finds himself face-to-face with a young Seraphina! Astonishingly, he has returned to the body of his 13-year...