"I will never marry an ugly woman!" Moanette, a young lady who was traumatized by the words of her childhood fiancé, has become a full-figured "armor" woman. She now lives alone in an old castle in the forest, nicknamed "the heavily-armored daughter" by the world, and is far away from love. Then one day, her ex-fiancé, the prince, and his squire, Percival, a handsome, tongue-tied knight, who is the source of her trauma, come to visit her!