Aoki Umi no Toraware Hime

In a neutral nation surrounded by other countries, Matsurika, a princess, faces a proposal from Prince Orland of Cantabria. One night, she is kidnapped and taken to the open sea by Raju, a man who identifies himself as a pirate. He claims he will sacrifice her at a legendary altar to fulfill his wish. The story centers on this mysterious pirate and the ancient legend surrounding the altar.