ข้อมูลอนิเมะAria The Animation

A young girl, Ai, arrives at Aria Company and demands that Akari give her a gondola tour of the city of Neo-Venezia. When Akari protests that, as a single (journeyman), she is not allowed to guide customers without a supervisor, Ai insists she be taken as a "friend" instead of a "customer," and Akari gives in. As they tour the city, Akari realises from Ai's reactions that it is a miracle to like something you had previously disliked.

During the annual flooding of Neo-Venezia, Akari is caught in a rain-shower away from home and shelters in her friend Aika's room at Himeya Company. Later, Aika gets in a fight with her strict mentor, Akira, and leaves to stay the night with Akari at Aria Company. In a flashback, Aika remembers her first meeting with Akari's mentor, Alicia, showing why she admires Alicia and wants to become an undine (gondolier).

While training in a strait with difficult currents, Akari and Aika witness the impressive rowing skills of a younger girl, Alice. She bluntly refuses their attempts at friendship, but is troubled by Akari's sincere smile, which is unlike those of other undines. The next day, Alice meets Akari and Akatsuki, an apprentice salamander (weather controller), and joins them first on Akari's gondola tour of Neo-Venezia, then on Akatsuki's tour of the floating weather station where he lives, becoming friends with Akari in the process.

Akari is asked to deliver an old letter. With the help of Woody, a sylph (airborn deliveryman), she find its destination but discovers it is now under water. She and Alicia read the letter and learn that it is from a woman writing to her husband who was away working on the terraforming of Mars from before the oceans rose and the planet was renamed Aqua.

Akari receives a mysterious message, which directs her to a secluded bay where she meets Aika and Alice following similar messages. Together, they find Alicia and Akira, who sent the messages, and they spend the day in special training and relaxed swimming.

Akari spends the night with Alice at Orange Company. While there, Akari meets Athena, Alice's mentor and roommate, the third of the so-called Three Water Fairies. She also meets Alice's kitten, Maa-kun, who Alice keeps hidden from Athena because pets are forbidden in the company dorms. During the day, while Alice is at school, Maa-kun runs away but is finally found at dusk by Akari and Athena, who knew about the cat all along.

Akira takes Akari, Aika, and Alice for training with a customer and picks up a honeymoon couple for a morning-long gondola tour that ends up being a full-day chore. Akira purposely entraps the three trainees in a maze formed by the rising tide and several low-lying bridges. By working together, Akari and her friends eventually find a hidden way out, while the husband learns a lesson about patience and pride.

In the first half of a two-part episode, Akari and Alicia give the Aria Company building a spring cleaning. President Aria, the company president and mascot, is eager to help but gets in the way instead and, depressed, he runs away. In the second half, President Aria emulate his favourate cat superhero from a comic book, as he both fails and succeeds helping other cats and a young boy.

Akari, Aika, and Alice visit Akino, the legendary founder of Aria Company, in retirement in the countryside. Akino asks for the girls' help with domestic chores, and Aika believes they are tests that will make them great undines. That night, Akino reveals that the secret to becoming a good undine is to enjoy every moment.