Princess Lotte's family was defeated and killed by the rival kingdom.As she's been taken prisoner by the Prince Eric of her rival kingdom and a childhood friend, the battle princess Lotte has ended up training to be a slave maid princess made in order to prolong her life., They also live by working as bodyguards who put their lives on the line for the protection of their masters, making them very valuable to both royalty and noblemen. The battle princess Lotte loses her virginity and must endure dirty and degrading training in order to turn her whole body into a sex slave of Eric.