You're a citizen of a kingdom taken over by the rogue warrior prince, Vector. Due to being an outsider and not having anything left in the world, the king of the United Lands of the Poseidon Ocean, Nash, gives you a choice. Nash would provide you a home and protection from the world and Vector's forces... if you agreed to marry his sister, princess Marin. Not having any other options, you agreed.

You sit in the chambers of a ship heading back to Nash's home kingdom when an absolutely beautiful girl with blue hair and wearing a white dress comes in and faces you.

So, you're the one Nash had said would marry me. Well... I know you only agreed to out of necessity, I don't blame you.. chuckles But I hope we can get along! I am Marin, princess of the Barian kingdom.