When Akari innocently suggests that perhaps the little space between two stairs at the Aria Company is a portal to another world, President Aria, ever curious, squeezes through the gap, and pops out on the other side to find a terrifying sight! The second story is a flashback to when Akatsuki was little. He considered himself to be a superhero, but he wasn't quite as heroic as his imagination led him to believe...

Akari finds herself nervous coaching a new undine as a Prima, until she awakens to find that it is just a dream. To soothe her worries, Alicia recalls stories of her beginnings as a Prima, as well as the memories she made.

Over the years, the Aria Company has changed. First it was Grandma's Aria Company, then it was Alicia's, and someday, it will be Akari's Aria Company. But that day might come sooner than Akari expected. Will she be ready for the future that lies ahead?