Tsubomi Hanasaki is a 2nd year middle school student who loves flowers and plants. When she transfers to Myodou Academy, Tsubomi decides to change her shy personality. Meeting the sprites of the Great Tree of Heart and becoming a brave Pretty Cure is far more than what she expected. Alongside her new classmate, Erika Kurumi, she fights against the Desert Messengers who want to steal all the Heart Flowers to rule the world.