Cecilio Astilia

The first prince of the Kingdom of Astilia, a vassal state of the Uldwaite Empire. When dragons that have lived in his territory for a long time began attacking livestock and threatening the people, he requested the Lamprogue family to investigate. However, he fell in love at first sight with Yifa, whom he met at the magic academy, and invited her to join his harem. Since becoming a vassal state of the empire, the country has allowed the accession of queens and the adoption of heirs, so there is no need to focus solely on male heirs, and the harem has become an institution like a women's university that provides advanced education to talented women regardless of their status, producing many excellent civil officials besides the king's wives. Seika, unaware that Yifa has feelings for him, thought that if Yifa wished, she might one day join the harem after being freed from slavery in this country.

Although not a villain, he is not particularly excellent either and has a strong inferiority complex towards his mother, the current and competent queen, obsessing over making his own achievements. Even after Seika discovered why the dragons were acting that way and a method for them to coexist with humans, he ignored what the people thought and insisted on exterminating the dragons to claim the credit, frustrating Seika. Eventually, he instructed Seika, who had become friendly with the dragons, to poison them. When Seika refused, he tried to detain Seika through the Lamprogue family by forcibly finding a reason to negotiate with the imperial government. Seika resigned himself to being captured, thinking he could just escape later to avoid making a big deal, but when Cecilio tried to separate Yifa from Seika for his own desires, Seika became furious, prioritizing his own desires over the welfare of the people. Seika, becoming emotional, scolded him as unfit to govern and shouted, "How dare you take Yifa from me!" Yifa also rejected him.