Nobita's the Night Before a Wedding

Doraemon and his friends travel to ancient Japan where they meet Kukuru. When Kukuru tells them that his tribe has been enslaved by Gigazombie, Doraemon decides to help him.

Shin-chan is approached by his time-traveling future bride-to-be Tamiko, who asks him to help save his adult self from the ruler of Neo Tokio.

Sewashi and Doraemon find themselves way back in time and meet Nobita. It is up to Doraemon to take care of Nobita or else he will not return to the present.

After bringing a fossilized egg back to life with the Time Cloth, Nobita finds himself the owner of a baby dinosaur. Everything is fine until it grows up. Nobita and friends use Doraemon's time machine to return it back to its own time.

Nobita travels to the future to show his beloved grandma his bride, but adult Nobita has fled his own wedding.

One year after the events of the anime, Rintarou begins to feel the repercussions of extensive time travel, and eventually completely fades from reality. Kurisu, being the only companion to remember him, now must find a way to bring him back.