Diamond Tiara, A promising young student at Canterlot High, and Silver Spoon, her just as bright friend. Two friends who stood by each other through thick and thin, no matter the consequences, no matter how hard their assignments were, the most loyal of friends who were as loyal to each other as could be.

However, after a near-death experience at the end of a school day, the two of them lose their continence and have to face up to the irrefutable facts: They had to spend the rest of their term in diapers.

With the loss of their continence, Diamond and Silver's friendship takes some emotional turns. Could this be the end of their friendship once and for all? Or will this be a new beginning for the two of them?