Sibling of the Petite Mermaid, also known as 人魚の姫 その１, is a captivating Japanese web novel that unfolds a tale of revenge as the little mermaid's sibling embarks on a vendetta against the prince. Set in a world filled with kingdoms, magic, witches, and supernatural elements, this adventure combines drama, fantasy, and a touch of the supernatural. With its unique mix of genres and themes such as oneshot, parody, and younger sisters, this novel promises an engaging and thrilling reading experience for fans of the fantasy genre.