Nobita's entire existence pivots on a single wrong belief. Doraemon drags him back to the moment of birth not to fix the plot, but to fix what Nobita thinks about himself. The movie doesn't explain adoption or belonging through dialogue, it just shows a kid finally seeing the day his parents chose him, over and over, until the doubt stops being louder than the evidence.
Nobita's convinced he doesn't belong in his family. Plagued by the feeling that he was adopted, he decides to settle the question once and for all. With Doraemon's help, the unlikely pair use the robot cat's time machine to journey back to the day of Nobita's birth, hoping to uncover the truth about his origins. What they discover isn't a simple answer. Traveling through time, Nobita witnesses the circumstances surrounding his arrival into the world, the hopes his parents held for him, and the chain of events that led to this moment. The journey becomes less about confirming his worst fears and more about understanding what it truly means to be part of a family. This film blends the whimsical time-travel mechanics Doraemon is known for with genuine emotional weight. It's a story about belonging and acceptance that speaks to anyone who's ever questioned where they fit in. The movie softens its premise with warmth, transforming a child's doubts into a deeper appreciation for the bonds that hold families together.