Sachi Matsumoto

Sewashi and Doraemon find themselves way back in time and meet Nobita. It is up to Doraemon to take care of Nobita or else he will not return to the present.

While Doraemon is asleep, a famous thief comes and steals his cat-bell. Without his cat-bell, Doraemon starts to act more and more like a normal cat. In order to stop this, Nobita, Shizuka, Suneo, and Gian have to go and search for his bell, so they go to a factory where all of Doraemon's gadgets are made.

Nobita has changed the real world to a world of magic using the "Moshimo Box" in admiration of magic. One day, Nobita meets Chaplain Mangetsu, a magic researcher, and his daughter Miyoko. Nobita learns from them that the Great Satan of the Devildom Star is scheming to invade the Earth. The Chaplain tries to find a way out using ancient books, however, the Devildom Star rapidly approaches the Earth by the minute, causing earthquakes and abnormal weather conditions. Nobita, along with his friends, Doraemon, Shizuka, Suneo, Gaian and Dorami, together with Miyoko, storm into the Devildom Star, just like the "Legendary Seven Heroes" in an ancient book in order to confront the Great Satan and peace returns to the world of magic.

War drama based on a short story by Akiyuki Nosaka.