One day in the Canterlot Castles, a shadowy figure passes through the Royal Guards and places a Party Bomb in Celestia's room, fleeing as the bomb covers the princess in rainbow paint and puts her under shock. After Twilight deals with the press about the situation concerning Celestia, she decides to team up with Rainbow Dash to solve the mystery of the culprit behind this entire operation. Joining with possible allies, encountering old friends, and meeting new enemies, this is a new adventure for the 2 members of the Mane 6.