Sakura Avalon is a ten-year girl who is entrusted to capture the magical Clow Cards after accidentally releasing them from their book. She mysteriously wins tickets to a trip to Hong Kong. Accompanied by guardian of the Clow Cards, Kero, best friend Madison Taylor, big brother Tori and school girl crush Julian Star, Sakura takes a break from her duties as Cardcaptor and visits the city.
However, mystery dreams, warnings from the city's magical community, and a pair of malevolent birds, lead Sakura to encounter an imprisoned sorceress who seek revenge against the Clow Cards' long-deceased creator. Sakura faces the wrath of the sorceress as her friends are threatened and a dark part of the Clow Cards' past is revealed.