Months after the Fall Formal, a trio of girls show up at Canterlot High and immediately cause dissent among the student body. The Rainbooms are the only ones who can put a stop to it, with the help of a certain Equestrian Princess. However, will they be able to handle this new threat as easily?

The Dazzlings are a group of sirens, born with the ability to bend others to their will through power of song. However, there's something not quite right about them. They're never far from one another and the way they speak of themselves is certainly... unorthodox. What could these powerful creatures be hiding?

After the Battle of the Bands, the Rainbooms go out in search of the Dazzlings in the hopes of extending their hand in friendship. What they find gives them a bit of a shock and will definitely take some time to get used to.