Manatsu Natsuumi is excited to move from her island home to the big city to stay with her mother, but she’s reckoned without the machinations of the Witch of Procrastination, who looks to suck out all the motivation of the citizens. Fortunately Laura the mermaid has been sent to the surface world to find the legendary warriors who can battle the Witch and soon Manatsu finds herself fighting monsters as Cure Summer!