[Machine Translation] The fifth prince, Zephiel, abruptly breaks off his engagement to Astrid, the son of a wealthy merchant, for selfish reasons. However, his selfishness takes its toll, and he is forced out of the royal family. Astrid, on the other hand, declares herself "Koros" to Zephiel and sets off on a journey, vowing revenge. Zephiel, who had been living as a commoner, ends up working as a servant in his ex-fiancee's house several years later. Astrid returns to Zephiel, who has grown into a robust knight. Zephiel is scared for his life, but Astrid comes along as his escort on a business trip...?