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Shizuka's Secret is a 512th chapter in Doraemon manga and volume number 88 in English kindle manga.
Plot[]
Nobita try to gift present to Shizuka, but he was confused about what should present he give to her, Doraemon suggest nobita to get a hair from Shizuka to put in the Questionputer. After that they both asked what he liked the most. Shizuka shyly mentions that she really likes roasted sweet potatoes. Then they brought a basket of roasted potatoes to Shizuka's birthday which made her very angry with both of them, and kicked them out of the party.