What if you born as a Pretty Cure and you had to choose between your two friends, one was going evil and other going good and you were either going good or evil? Well, Hoshimiya Nanako (Cure Fate) is that girl and is having a hard time. Her parents have apparently "died" and her uncle (King Hikaru) won't tell her anything she needs to know! So while worrying about Yozora Yoru (Cure Night) who might become a villain and Hikari Asa (Cure Morning) who might become too "princessy", Nanako worries about herself becoming either dark or light and fights with the two girls to defeat Dark Destiny before everything is revealed.