Cardcaptor Sakura

Sakura, Tomoyo, and the Giant House (1x11)

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Sakura is invited to Tomoyo's home for the first time. She is shocked to find Tomoyo's house to be an elaborate mansion complete with its own maids. Tomoyo presents a special chest and explains the key to the box bounces out whenever she tries to open it. Kero senses it's the work of a Clow Card!