Momona is a regular junior-high school student from Jewel Land. At her cousin's wedding, she feels a twinge of jealousy toward the bride, Lady Diana, because she had a small crush on that cousin. But after seeing Lady Diana with him, Momona grows fond of her and accepts her as her cousin's wife. Right when Lady Diana is about to meet her properly, Momona gets whisked away to a snowy area of Jewel Land, where the ruler, Lady Jewel, is addressing the Petit Ladies—girls chosen as Jewel Candidates to become the next Lady Jewel. Momona meets Ruby, a white rabbit who becomes her partner and mentor, guiding her through the trials needed to earn the title. The candidate who completes the most challenges wins and becomes the next Lady Jewel. However, standing in her way is Lillian, another girl determined to claim the title so she can install her brother, Cayenne, as her King. Momona soon develops feelings for Cayenne, but Lillian tries to keep her at a distance. Cayenne seems to return Momona’s affection, but who will ultimately be chosen as Lady Jewel? And can Momona and Lillian ever become true friends? Will Cayenne and Momona find a way to be together?