Doraemon, Nobita, Shizuka, Gian, and Suneo hear the legend of the Sun King and try to find him. Along the way they meet Dakidaki, a geeky girl who offers to help them out. With the help of the Small Light, Submarine, Copying Bread, and other gadgets, will Doraemon, Nobita, Shizuka, Gian, Suneo, and Dakidaki find the Sun King?