Her father always claimed to be the strongest Holy Knight from another dimension, but he died in the modern world leaving her all alone at age four. When a mysterious creature from his keepsake box offers to send her back to his original world to save him, she jumps at the chance. However, upon reuniting with him in the past, she realizes the "legendary hero" is nothing like the stories he told her - in fact, he seems to be hiding his true power behind a very strange personality.