When a 22nd-century thief named Kaito Deluxe steals Doraemon's bell, Nobita Nobi watches his robotic cat start acting like an ordinary house pet without it. Nobita, Shizuka Minamoto, Suneo Honekawa, and Takeshi Gouda chase the theft to the future's Secret Gadget Museum, where a young guide named Kurt shows them inventions like the very first Anywhere Door ever built. Armed with a Sherlock Holmes gadget, the group hunts the culprit through the museum's exhibits, unaware that the bell was taken for a part hidden inside it rather than for the bell itself.