The hottest topic in Minato Mirai, Yokohama, is the defeat of Fusion by the Pretty Cures! Girls are donning costumes of their favorite heroines and role-playing in droves. Yet, Sakagami Ayumi, the new transfer student, remains alone and uninvolved. While walking home from school, Ayumi stumbles upon a peculiar creature. Naming it Fu-Chan, the duo quickly form a bond. However, Fu-Chan is, unbeknownst to Ayumi, a remnant of Fusion with the power of darkness. In its effort to cheer Ayumi, it absorbs all her dislikes, wreaking havoc in school and beyond. To aid Fu-Chan in understanding Ayumi's true desires, the 28 Pretty Cures reunite. Together, their combined strength emits a miraculous light.