Set in the early 24th century against the backdrop of the city of Neo Venezia on the planet Mars. No longer the barren red planet, Mars has been flooded, inhabited and is something of a tourist hub for those looking for rest, relaxation and a gondola ride – the primary mode of travel in Neo Venezia. The Undines are professional gondoliers, tour guides for the people passing through. Akari Mizunashi is an Undine in training and this is a piece of her story.Drift peacefully into Neo Venezia, a city on the planet Aqua (formerly known as Mars). By the 24th century, humans have found a way to colonize the previously uninhabitable planet. As futuristic as that sounds, Neo Venezia is still teeming with rustic beauty; gondolas on wide canals and waterways are the main mode of transportation. The city itself is a faithful replication of Manhome’s (the planet formerly known as Earth) Venice. To make sure that residents and tourists alike get the most from Neo Venezia’s many wonders, companies offering guided tours via gondola were formed, one of which is named Aria Company. This is the workplace of Akari Mizunashi, a free spirited teenager from Manhome who is now a novice Undine (the title given to tour guides). Join Akari as she becomes intimately acquainted with other Undine, tourists, Neo Venezia’s residents, and even the city itself, learning many valuable life lessons along the way, such as the wonderful truth that there are such things as manmade miracles.