Anjuu Sendou is a kind girl who has just begun her first year at Seiryuu Academy Middle School. She currently lives away from home as a boarding student, accompanied by her pet, Lime. Her father is a sorcerer, and her mother is an expert in Chinese kenpo. Both are famous, particularly her mother, who is known as Dragon Momoka. Due to her mother's renown, the executive committee wants Anjuu to join the student council. However, the council's president considers her a weak girl, so she decides to catch the school thief to prove him wrong. As the situation becomes more difficult, she wishes to become stronger. Consequently, her pet suddenly transforms into a small winged child (it cannot yet transform into a dragon, as it is still a child) and informs her about her power. During a second attack by the thief, Anjuu, with Lime's help, transforms into a new Saint Dragon Girl, defeats the enemies, and becomes the school's protector. Will the student council members discover the true identity of the "warrior" girl? Will Anjuu be able to keep her secret?