The Straw Hat Pirates landed at Asuka Island, home of the most valuable sword in the world: The Seven Star Sword. Which was said to curse anyone who takes it in possession. When they got back to the Going Merry, they discovered that Zoro is missing from his guard duty. Before they could plan out a search party to relocate him. Luffy and friends escape from the port as Marines were on their tail. They found a new place to dock, which is near a village. Whose job is to keep the Seven Star Sword sealed. Soon it was attacked by the Marines, and among them is Zoro. Luffy and the others don't know why he's helping out the Marines. But it all comes to conclusion when Luffy encounters Saga: Zoro's childhood friend from Swordsman training.
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.