On one bleak winter day Alicia, Aika, and Athena sit around a fire, drink cups of hot cocoa, and reminisce about their younger days. Light is shed on how they all came to be friends.
When Akari sets off to visit the oldest bridge in Neo-Venezia, she senses someone is watching her. Once she arrives, she sees the city is entirely different from how it was before. Now she wonders what strange mysteries the old bridge holds.
Akari meets a little girl who gives her a letter and requests she deliver it. But if she is going to have any chance of keeping her promise, she'll have to enlist the help of flying messengers known as Sylphs.
It's time to ring in the New Year and everyone in Neo-Venezia has come together to celebrate. But soon Akari and Ai stumble upon a strange New Year's gift from Aqua itself.
Akari receives a mysterious hand-written invitation to visit Neverland, but she wonders about the uncertainties that await her as she sets off toward a deserted island.
Aika wants to become as good as the legendary Great Water Fairy, the greatest undine of all time. But when she's sent to visit the legend at her house, Aika realizes she's nothing like she expected.
While training in a particularly tough stretch of water, Akari and Aika meet a girl from Orange planet who seems to be having no trouble at all. Her name is Alice, and she's famous for being one of the youngest yet most talented undines in Neo Venezia.
The trainees encounter a couple on their honeymoon who think being an undine is simple work. Now it's up to Akira to teach everyone what it really means to be an undine.