Aqua is a world where each day moves slowly and where every encounter with a new person or place feels like coming home. And yet there are plenty of experiences that emphasize how many mysteries still shroud the city of Neo Venezia. You could spend your whole life there and never even delve beneath its surface of water canals and cobbled lanes. Aria the Natural, the second series in the franchise, features both Neo Venezia’s secrets and the very special undine who comes closer than many others do in discovering them. Among the several supernatural events, my favorites always include the border along the kingdom of cats, a world supposedly ruled by a cat larger than two humans stacked together. Akari’s strange ability to both see and interact with Cait Sith and other cats in the border between worlds conveys the depth to which she has come to understand and love this city entrenched in the past.