[2] The film opens during the events of the previous movie when Nobita is in the day before his wedding with Shizuka, however his future self is seemingly distraught.

While searching for a place to hide his exam results, he finds an old teddy bear given by his late grandmother, triggering memories of her.

To help him overcome his resentment, Doraemon uses the "Switching Rope", a trial gadget sent to him earlier, to swap the bodies of the two Nobita's.

While attempting to evade them, he consistently fades in and out of consciousness, but his friends join in and eventually win scaring the bullies off.

Future Nobita then finally realizes the reason why Shizuka truly likes him and decides it is time to return home but not before going to the day of his birth, where they learn about the meaning of their name.

Future Nobita delivers a heartfelt speech referencing his recent experiences and notices his past self with his crying grandmother observing the wedding.

During the end credits, many points of Nobita's past and future life and the events on the current day it takes place in are seen with the final one showing a frame of him with his grandmother and him with Shizuka.

[13] Debuting on 416 screens with limitations on seating capacity due to COVID-19 pandemic, Stand by Me Doraemon 2 earned $3.7 million on 305,000 admissions in its first weekend and ranked number-two on Japanese box office.