Doraemon Movie 05: Nobita no Makai Daibouken

Nobita is tired of struggling with ordinary life and becomes convinced that everything would be easier if magic were real. Using Doraemon's What-If Phone Booth, the two rewrite the world so that magic replaces science, only to discover that Nobita is no more talented at spells than he was at anything else.

The joke turns dangerous when they meet Miyoko Mangetsu and learn that the Demon World is drawing close to Earth. Its ruler, the Demon King, intends to invade their world, and a prophecy points to a group of heroes capable of stopping him. Unable to simply undo the danger they created, Nobita, Doraemon, and their friends must enter the Demon World themselves.