Murder Princess

Murder Princess (マーダー·プリンセス, Mādā Purinsesu) is a manga series by Sekihiko Inui. An OVA series was later produced by Marvelous Entertainment and Bee Train based on the manga. The anime had been licensed by ADV Films but was transferred to Funimation in 2008.

Plot
In the kingdom of Forland, a coup d'etat occurs which leads to the death of the King. In the last moments of his life, the King sends his second child, Princess Alita Forland to escape. Unfortunately, while fleeing, a life and death situation between Alita and the bloodthirsty bounty hunter Falis causes the two of them to switch bodies. Desperate for the safety of her Kingdom, Alita begs Falis to return and protect the Kingdom, offering herself as collateral. After a swift beating on the rebel forces, Falis resumes the title of Princess of Forland, leading to the birth of the most savage princess in their land, the "Murder Princess."