Kou 1 Desu ga Isekai de Joushu Hajimemashita Gaiden

Kou 1 Desu ga Isekai de Joushu Hajimemashita Gaiden, also known as 高1ですが異世界で城主はじめました 外伝, is a captivating Japanese web novel that falls under the genres of ecchi, fantasy, and harem. With elements like monster girls and vampires, this novel offers a unique and intriguing storyline for readers seeking an adventurous and fantastical tale.