One day, Nobita picks a small rocket from which a small-sized humanoid alien named Papi comes out. He comes to Earth from a planet name Pirika to escape its evil PCIA army. At first, Doraemon and his friends are confused by Papi's small size, but with the gadget "Small Light", they shrink and play together. However, the whale-shaped battleship which was chasing Papi comes to Earth and attacks them. Papi blames himself for having involved everyone but, tries to fight against the PCIA army. In order to protect Papi and his planet, Doraemon and his friends travel to Pirika.

The kingdom of Metallicana is under attack from the Four Lords of Havoc. This party of villains—ninja master Gara, deadly thunder empress Nei Arshes, cold and calculating Kall-Su, and enigmatic dark priest Abigail—will stop at nothing to get what they want, even if it leaves utter destruction in their wake. High Priest Geo is desperate to help save the kingdom and its people. He unleashes the mighty wizard Dark Schneider, a man who used to be an ally of the villains. Unfortunately, Dark Schneider has his own plans in mind. Will he stop the Four Lords of Havoc or join them in their conquest of the world?

This is a young girl's story. She is naive and enquisitive about the world. However, a tragic accident altered her life. Her loved ones abandoned her, leaving her alone and despondent. She adopted boxing as a means of expressing her inner pain. But she had no idea how tough and hazardous this journey would be.