Nono Hana is a middle school student who encounters a baby named Hug-tan and her guardian, Harry, who fell from the sky. Hana learns that they have been pursued by the evil Criasu Corporation, who wants Hug-tan's Mirai Crystal and change the present. Protecting Hug-tan causes Hana to gain her own Mirai Crystal and transform into the Pretty Cure of High Spirits, Cure Yell.