Ep. 1: That Encounter At The Carnival...
When Ai visits Akari for Neo-Venezia's Carnevale, she helps out at Aria Company. Before the festival starts, she sees President Aria leave by himself, and Akari tells her he'll be gone for the duration. On the first day of celebrations, Akari and Ai meet Casanova, the mysterious masked master of ceremonies of the Carnevale named after the historical figure. Later, on Ai's last day on Aqua, while talking with Aika and Alice they spot one of Casanova's attendants. They chase after him but Akari and Ai get separated from the others. Eventually they confront Casanova, who invites them to join his cheering procession for a while. When he eventually stops them from following any further, he gives them each a jasmine flower before revealing that President Aria is one of his attendants, and that he is Cait Sith, the legendary king of Aqua's cats. When Aika and Alice finally find Akari and Ai, they claim that Casanova is a fairy. (Source: Wikipedia)