Cradle, the country that Medley lives in is currently on disaster ever since the Sky Castle became silent. What could be the reason behind? That's when Medley has been summoned as one of the Key to the Sky Castle. But being a Key, you have to tame the 11 Songs of the said Castle and choose one of them to be her Song until the Formal Ceremony comes. Will Medley be able to succeed on her mission and bring back the peace and stability on her country? Will she be able to find love with one of the Songs? "We are the Disciples of the Sky Castle, serving under King Orpheus. We were ordered to summon the girl name Medley Donahue as a Key to the Sky Castle."