Nobita misses his granny that died a few years ago, so Doraemon takes Nobita to the past to see his grandmother one more time. But they face through a lot of things such as the younger selves of Nobita and his friends, and young Nobita's mother that doesn't recognize Nobita or Doraemon.

Source: Wikipedia

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Parent story: Doraemon (1979)
Other: Doraemon: Nobita no Taiyou Ou Densetsu
Alternative version: Stand By Me Doraemon 2