Take a serene journey to Neo Venezia, a charming city located on Aqua, once known as Mars. Despite the futuristic setting of the 24th century, this picturesque city retains a nostalgic allure with gondolas gracefully navigating its canals. Modeled after Earth's Venice, Neo Venezia offers enchanting gondola tours to residents and visitors, including those provided by Aria Company. Here, Akari Mizunashi, a spirited youth from Manhome, embarks on her new role as a novice Undine, guiding others through the city's marvels. Through her interactions with fellow Undine, tourists, locals, and the city itself, Akari discovers profound life lessons, including the beauty of human-made wonders.