winter 2000
Doraemon: Obaachan no Omoide
Doraemon: A Grandmother's Recollections
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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