Prologue:

We all know the story on the Seven Princesses of Heart, and how Sora set out on a journey to save one of them, his friend Kairi. But how different would things be if Sora wasn't the only one who wielded a Keyblade? Harmony, a young girl who has no memory of her past, like Kairi, and also grew up with her like a sister since childhood. Read to find out what destiny has in store for Harmony and Sora as they travel with Donald and Goofy to many worlds in search of Riku and Kairi, and make friends to help them along the way.