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Mom and Fumi are on their way home from having lunch near the train station when Fumi's stomach starts to hurt. Telling her to hold it until they get home, Mom talks about her childhood experience of urgently needing a toilet. While watching "Cinderella", Bunji hits Fumi with simple questions. Fumi's answers are curt. Unconvinced, Bunji extends the topic to a picture book of "Momotaro"...