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.