After suffering yet another scolding from his parents, Nobita begins to suspect that they are not really his father and mother. Along with Doraemon, he decides to go back in time to the day of his birth in order to discover the truth.

~ translated from the Italian wikipedia

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Parent story: Doraemon (1979)
Other: Doraemon: Nobita to Robot Kingdom
Other: The Doraemons: Goal! Goal! Goal!!
Alternative version: Stand By Me Doraemon 2