Luna de Rimzbel

Luna is the main character of the OVA.
She is the second princess of Rimzbel, and widely known as "The Tomboy Princess". She is a brave young princess who is willing to fight and defend her land and family.
When the castle comes under attack from warriors of Dambas, Luna merges with the demon Varga, who had been sealed under the castle, to defeat the army.
During the ensuing chaos Luna's younger sister Vina is kidnapped and Luna setts out on a journey, with her friend Roco, to rescue her.