A young colt have been these weird thoughts lately, like it is any of this for real or not? This colt name Key Light has always wanted to go and see other worlds beyond the Destiny Islands after him and his best friend Dusk Wing met this filly from another world suddenly appeared named Heart Shine.

One day, when their raft was finished, something happened to their world and Key ended up in another world when his world was sent into darkness. Now equipped with some sort of special weapon that chose him, he's on a quest to find his two missing friends and save other worlds along the way.

He's not alone in all this as the Young Six was sent to look for a key by orders of Princess Twilight after she discovered the stars in the sky were going out. Little do they know that they're dark forces that will try to stop them.