The first episode's story starts with Ai practicing on the gondola with Akari. As they travel through a canal, they meet Aika and Alice. All three have not had much time to meet since becoming Prima undines. Considering even the little time they spend together a "miracle," Akari remembers a certain incident and relates it to Ai. 
 
The second episode's story begins with Ai relating a story to Akari of her experiencing a "miracle" while she was practicing. She saw Cait Sith as she was traveling down an unfamiliar path. When she disembarks from her gondola to follow it, she meets two Single undines from Himeya company and Orange Planet in the middle of practice. 
 
(Source: Anime News Network)

On the planet Aqua, a world once known as Mars, Akari Mizunashi has just made her home in the town of Neo-Venezia, a futuristic imitation of the ancient city of Venice. In pursuit of her dream to become an Undine — a gondolier who leads high-end tours around the city — Akari joins as a trainee with the Aria Company, one of the three most prestigious water-guide companies in Neo-Venezia. There, she explores the beauty of the city and the world along with other trainees from Aria and rival companies, working hard for her dreams and making new friends along the way.
 
(Source: Tokyopop)
 
Note: Chapter count includes 7 extra chapters.

In Neo Venezia, Akari, Aika, and Alice continue to work diligently toward the day they become full-fledged Prima Undine (a professional tour guide gondolier). The girls have come far since they began their training, and they are slowly forming their own distinctive styles as tour guides for the city. 
On the long journey towards their goal, the girls have relied on the advice of their seniors from their respective companies: the patient and understanding Alicia from Aria Company, the strict and proper Akira from Himeya Company, and the clumsy yet caring Athena from Orange Planet Company. 
Will the girls be able to blend the advice from their mentors with their personally acquired knowledge of Neo Venezia to become praiseworthy Prima Undines? 
Welcome once more to Neo Venezia; the city that personifies warmth and tranquility.

The season is fall and the city of Neo-Venezia is covered in fallen leaves. Something is bothering Anya, who works at Orange Planet. Her senior colleagues Alice and Athena haven’t seen each other due to their busy schedules, which is making Athena feel sad. But for some reason, Alice seems to be avoiding her altogether. With her friends Ai and Azusa’s help, Anya tries to find a definitive way for Alice and Athena to get together. But during this time, Anya learns of a situation that only she can see because of where she stands. 
 
(Source: Shochiku Films)

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