Doraemon: Obaachan no Omoide

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.

The movie won the 2000 Mainichi Film Award for animation.