Ep. 1: Ai and Akari encounter Casanova during Neo-Venezia's Carnevale festival events.

Ai visits Akari at Aria Company for Neo-Venezia's Carnevale, where they observe President Aria departing alone before the festivities begin. On the first day, the pair meets Casanova, the masked master of ceremonies named after the historical figure. Later, on Ai's final day on Aqua, they spot one of Casanova's attendants while speaking with Aika and Alice. After chasing the attendant, Akari and Ai become separated from their friends and confront Casanova, who briefly invites them to join his cheering procession. He then stops them, giving each a jasmine flower and revealing that President Aria is his attendant and that he is Cait Sith, the legendary king of Aqua's cats. When Aika and Alice eventually locate them, they claim Casanova is a fairy.

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