Aine and Mio are in high spirits as the decision for an unveilling stage for the long-desired Diamond Dress has been decided. During that time, Mio's father who was overseas has returned from his trip. Actually, Mio's father is a world-famous designer! Not only that, there's also another surprising truth revealed about the Diamond Dresses!?

After entering the circle of top idols, Aine and Mio are very active in their Aikatsu! activities. Suddenly, rookie reporter Mamiko Habara aims to get the scoop on those two! And the two display their Friends' Power without any problem, even if they were going against the paparazzi. During that time, the precious truth that Aine and Mio realized is...?