Nobita Nobi is pressed by Gian and Suneo Honegawa to lead them to an unexplored part of the world for spring break, and he begs Doraemon to help. With a quick flick of a gadget, the robot cat pulls out a device that can snap pictures of the African continent, sparking a wild adventure that starts with a simple search but quickly spirals into something much larger. The day begins with a small act of kindness when Nobita befriends a stray dog; the dog then follows him, and soon Peko becomes a loyal companion who helps Nobita and his friends, even as Nobita fears his mother’s disapproval of pets. After a quick clean-up of the new canine member of the team, Nobita’s mother loses her purse and the dog unexpectedly helps her recover it; in gratitude, she agrees to keep him as a pet, and the group gives the dog a name that suits him well.
As the group, including Shizuka Minamoto, Gian, and Suneo Honegawa, begins to plan their expedition, the dog’s instinctive curiosity leads them to something extraordinary. Peko notices a colossal statue hidden within the dense forests of the Democratic Republic of the Congo, then known as Zaire, and Nobita, after consulting with Dekisugi, deduces that the area has remained uncharted because a perpetual fog seems to cloak it—something ordinary satellite imagery would miss. Fueled by the possibility of a discovery no one has ever made, the kids, along with their friends, march toward the unknown with Doraemon’s gadgets in tow, determined to uncover the mystery of the statue.
The journey isn’t smooth from the start. On the first day of the expedition, Gian grows frustrated with the team’s overreliance on Doraemon’s technology and the group’s reckless enthusiasm. He storms off, vowing not to return, only to be confronted that same night by the statue itself—an ancient, enigmatic figure that speaks in dreams and visions, hinting at hidden treasures and testing Gian’s sense of courage and leadership. When he returns the next day, he insists that Doraemon leave all gadgets behind, trying to prove his own bravery and resolve. The river they navigate is riddled with crocodiles, and a ship accident forces them to abandon their Anywhere Door, leading them to a native village where the locals reveal more about the statue and the perilous path ahead.
The natives tell the group they must cross a lion-infested savanna and a perilously deep gorge if they want to reach the statue’s heart. The journey tests everyone’s resolve, and Gian’s bravado ends up angering the locals, who fear hubris may invite a curse on their village. That night, the group contends with fear and fatigue as they camp, and Nobita’s companion dog, Peko, comforts him, helping the team keep going. The journey’s dangers reveal a deeper purpose: Peko himself is not just a pet, but a being with a backstory that will soon unfold.
Across the savanna, the statue reappears, its presence driving away the lions and signaling a shift in the mission’s stakes. At the base of the gorge, the team discovers the deeper truth behind the mystery: Peko is more than a loyal dog—he is a prince of a hidden kingdom of intelligent, bipedal dogs. He explains that a power-hungry minister, Daburanda, and his slick right-hand man, Dr. Kos, have executed the king and plotted to conquer the world. Peko had been sealed away in a coffin inside the gorge, but he escaped through an underground river and crossed paths with Nobita’s group, gaining trust and new allies along the way. The mission now becomes personal: Doraemon and friends must aid Peko in reclaiming his throne and stopping Daburanda’s schemes. To complicate matters, Daburanda’s forces kidnap Princess Spiana, intensifying the race against time.
The team’s path is complicated by a prophecy Burusasu, one of Peko’s loyal bodyguards, shares: “When the world is shrouded in darkness, ten foreigners will come and move the statue’s heart to save the palace.” Doraemon considers who the ten foreigners might be, but soon realizes that only five travelers stand before him. To calm hunger and keep morale up, Doraemon deploys the Anticipating Promise Machine, which temporarily fills everyone’s stomachs with a sense of security, while binding them to fulfill the promised meals the next day. The tension rises as Daburanda’s soldiers close in, Dr. Kos arrives with an aerial fleet, and the princes’ guards scramble to keep the group safe.
That night, Chippo, a young puppy who befriends the group, becomes a crucial ally, and the team rescues Burusasu from a prison camp. Daburanda and his lieutenant Saberu sense the fugitives’ presence and launch a new hunt, forcing the group to scramble for safety. The prophecy resurfaces and becomes a guiding light as Shizuka uses the Anticipating Promise Machine to conjure otherworldly aid, suggesting the travelers may already be closer to the statue’s heart than they realize. The group’s split-second decisions—who to trust, what gadgets to deploy, and how to navigate treacherous terrain—culminate in a dramatic clash on the statue itself, where the heart of the statue is revealed to be a powerful mechanism that can bring the statue to life like a robot if activated.
In the ensuing battle, a second wave of Doraemon, Nobita, Shizuka, Gian, and Suneo Honegawa arrive with improvised weaponry, creating a two-front assault that pushes back Daburanda’s army. Nobita temporarily lags behind in the duel against the capable Saberu, but with the Denkomaru sword, he finds his footing and defeats his rival, earning a crucial victory. Dr. Kos’s aerial fleet presses a sustained attack on the ground, forcing the group to improvise under pressure. Through bold teamwork—the unity of the two Doraemon-augmented groups—the travelers manage to reach the statue’s core, where the device is ready to unleash its power.
With the statue’s heart activated, Daburanda is driven back into his palace, while Princess Spiana is rescued in time. Peko steps forward, calling upon the statue to restore his kingdom and affirm his rightful leadership. The other Doraemon and Nobita groups rally behind him, and a new Anywhere Door is provided to the original Doraemon crew so they can return home and reunite with their families. Yet the adventure doesn’t end there. The Anticipating Promise Machine’s final command requires them to fulfill one last vow: to travel back in time using the Time Machine and aid their past selves in securing entry to the statue before Daburanda’s forces close in.
The film closes on a hopeful note as the friends prepare to turn back the hands of time, ready to fight alongside their past selves and to ensure the statue’s heart remains safe from those who would misuse it. The journey has transformed each traveler, revealing the strength of friendship, courage, and the willingness to stand up for others—even when the odds seem overwhelming.
