Feeling exhausted by his mundane routine and disheartened by always being the weakest, slowest, and least intelligent, Nobita finds solace in his dreams. With the help of Doraemon's gadgets, he embarks on an amazing imaginary adventure. However, when an evil magician threatens to destroy his dreamland, Nobita rallies his companions to join him in his fantasy realm as the valiant Three Musketeers, ready to defeat the villainous foe.