碧き海の囚われ姫•Aoki Umi no Toraware Hime

The Captivity Princess of Blue Sea

In the only neutral country surrounded by many other countries, Kourozen, also known as God's country the princess, Matsurika, is troubled by a proposal from Prince Orland of Cantabria, a major power. One night, Matsurika is suddenly kidnapped by an intruder and brought to the open sea. The man, Raju, who calls himself a pirate, says he will sacrifice Matsurika on the legendary altar, to attain his wish— The princess of God's country, the pirate surrounded by mystery. A pirate tale about an ancient lore and the legendary altar. Let the battle begin!!! (Source: Forbidden Garden)