Catherine Ray, younger sister to footballer Julian Ray, pursues ballet studies at a school in Genoa, Italy. She aspires to become a prima ballerina. Catherine holds an optimistic outlook, believing play should focus on dreaming and enjoyment, a perspective her more serious brother Julian sometimes deems overly idealistic.

She forms a romantic relationship with the protagonist, Hikaru Kikkawa. Their bond, depicted through shared moments like lying together in flower fields, centers on emotional connection and remains largely innocent. Catherine's presence in Genoa serves as a key motivator for Hikaru, especially during his challenges to gain his aunt's approval for football.

Fellow ballet students include Sophia Ruggiero (Roberto Concini's girlfriend), Monica Rossi (who harbors feelings for Hikaru), and Lisa Palmioli. A pivotal narrative moment occurs when Catherine receives an invitation to join a prestigious ballet company in Paris. Accepting this opportunity requires her to leave Genoa, separating her from both Julian and Hikaru before the series' conclusion.

Following her move to Paris, Catherine maintains contact with Hikaru through letters, indicating their ongoing emotional connection. Her documented appearances are confined to the original television series.