Tsubomi Hanasaki is a 2nd year middle school student who loves flowers and plants. One day, she dreams of a mysterious flowering tree that wilted, causing the sprites to disappear. When she transfers to Myodou Academy[note 1], the sprites that she saw in that dream appeared before her. The sprites begged Tsubomi to become Pretty Cure to protect the Great Tree, but she refuses. However, a sudden attack from a mysterious enemy came, and the Heart Seed of her new classmate, Erika Kurumi, is stolen. To save Erika's heart, she had no choice but to become a Pretty Cure and fight.