Having dreamed of being in a world of magic, Nobita and Doraemon used the what-if-telephone-booth gadget to turn the world into one that is based on magic instead of science. Little did they know that demons exist and threaten this magical world.

Source: ANN

Note: Screened as a double feature with Ninja Hattori-kun Plus Paaman: Chounouryoku Wars.

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Parent story: Doraemon (1979)
Alternative version: Doraemon: Nobita no Shin Makai Daibouken - Shichinin no Mahou Tsukai