Nobita gets what he wants and immediately regrets it. A world running on magic should be his fantasy, except he's still terrible at it, still powerless, still the same kid in a different ruleset. The real gut of this one is watching him chase down a Moshimo-box his mom threw away because he can't accept that changing the world doesn't change him.
Nobita uses Doraemon's Moshimo-box to turn the world into a place where magic is real. Spellcasting takes the place of science and technology, and everyone relies on it in daily life. Everyone except Nobita, naturally. His usual trouble with spells frustrates him enough that he wants to reverse the change, but his mother has thrown the box away. When Doraemon and his friends meet Professor Mangetsu, a scholar of magic and magical creatures, and his daughter Miyoko, they learn of a looming threat. The Star of the Underworld is drawing dangerously close to Earth's orbit, putting the planet's future at risk. Following ancient writings, the group must journey to the Underworld and strike the Underworld King's heart with a silver dart. What starts as Nobita's wish becomes a fantasy adventure with the fate of the world on the line.
