Doraemon: Nobita and the New Castle of the Undersea Devil (2026) – Release Date, Story, Cast and Everything You Need to Know
Doraemon returns to the big screen in 2026 with an exciting underwater adventure! Doraemon the Movie: New Nobita and the Castle of the Undersea Devil brings the beloved robotic cat, Nobita, Shizuka, Gian, and Suneo into a mysterious world beneath the ocean, where ancient secrets, strange creatures, and a dangerous threat await them.
The 2026 animated film is a new interpretation of the classic 1983 Doraemon movie Nobita and the Castle of the Undersea Devil. With a fresh cinematic presentation, a mysterious underwater civilization, and a mission that could determine the fate of Earth, the movie offers a new adventure for longtime fans and younger audiences alike.
Doraemon: Nobita and the New Castle of the Undersea Devil – Movie Details
Title: Doraemon the Movie: New Nobita and the Castle of the Undersea Devil
Japanese title: 映画ドラえもん 新・のび太の海底鬼岩城
Release year: 2026
Japanese theatrical release: February 27, 2026
Genre: Animation, Adventure, Family, Fantasy, Science Fiction
Director: Tetsuo Yajima
Screenplay: Isao Murayama
Original creator: Fujiko F. Fujio
Music: Takayuki Hattori
Main characters: Doraemon, Nobita, Shizuka, Gian, and Suneo
Japanese animation studio: Shin-Ei Animation
The film is the 45th theatrical feature in the Doraemon movie franchise and revisits one of the series’ most memorable underwater adventures.
What Is the Story of Doraemon: New Nobita and the Castle of the Undersea Devil?
The adventure begins during summer vacation, when Nobita and his friends cannot agree on where they should go camping. Instead of choosing a traditional destination, Doraemon suggests a more unusual plan: camping in the middle of the ocean.
Using Doraemon’s futuristic gadgets, including the Underwater Buggy and the Tekio Lantern, the group ventures beneath the waves. Their underwater journey introduces them to fascinating marine creatures and an unfamiliar world filled with mystery.
Everything changes when the friends discover a sunken ship. This discovery leads them to a mysterious young man named El, who comes from the underwater nation known as the Mu Federation.
The underwater inhabitants have their own society, history, and reasons for distrusting people from the surface. As Nobita and his friends become involved with this hidden civilization, they learn about a terrifying place known as the Castle of the Undersea Devil, or Oni-Iwajō.
Then comes the alarming news: the mysterious castle has begun to move.
What initially seemed like an extraordinary camping trip quickly turns into a dangerous mission. Doraemon and his friends must uncover the truth behind the castle, navigate the tensions between the underwater people and surface dwellers, and confront a threat that could endanger the entire planet.
Their survival depends on courage, teamwork, and the trust they place in one another.
Meet the Main Characters
Doraemon
Doraemon is the blue robotic cat from the future whose incredible gadgets repeatedly help Nobita escape difficult situations. In this adventure, his technological inventions become essential for exploring the deep ocean and surviving the dangers hidden beneath the sea.
Nobita Nobi
Nobita may be clumsy, easily frightened, and often unlucky, but his kindness and loyalty make him an important member of the group. As the underwater adventure grows more dangerous, he must find the courage to stand beside his friends.
Shizuka Minamoto
Shizuka is the kind-hearted and thoughtful member of the group. Her compassion and ability to understand others help the friends navigate a world where suspicion and mistrust threaten to stand in the way of cooperation.
Gian
Gian is known for his strength, confidence, and sometimes intimidating personality. Despite his rough behavior, he cares about his friends and can be counted on when the group faces danger.
Suneo Honekawa
Suneo is clever, talkative, and often eager to show off. Although he can become frightened when things go wrong, he remains an important part of the group’s adventures.
El
El is a mysterious young man from the Mu Federation, an underwater civilization. Initially responsible for keeping watch over Doraemon and his friends, he becomes an important figure as the group discovers more about the underwater kingdom and the danger threatening it.
The Underwater Buggy Returns
One of the most interesting elements of the movie is the Underwater Buggy, a special Doraemon gadget that serves as transportation during the group’s deep-sea expedition.
Unlike an ordinary vehicle, the gadget can travel underwater at high speed and communicate with its passengers. It helps Doraemon and his friends explore dangerous ocean environments that would otherwise be impossible for humans to navigate safely.
The underwater setting also gives the film opportunities to showcase colorful marine life, sunken ships, mysterious landscapes, and the enormous structures of a civilization hidden beneath the sea.
The gadget is voiced by Ryo Hirohashi in the Japanese version.
A New Version of a Classic Doraemon Adventure
The original Nobita and the Castle of the Undersea Devil premiered in 1983 and became a memorable entry in the long-running Doraemon movie series.
The 2026 film revisits that story for a new generation, bringing its central underwater mystery back to cinemas.
Rather than simply relying on nostalgia, the new production introduces its own cinematic presentation of the underwater world and gives renewed attention to the relationship between Nobita’s group and El.
The story retains the essential ingredients that have made Doraemon movies popular for decades: imaginative technology, an unfamiliar world, friendship under pressure, and a challenge that requires the characters to work together.
For viewers who remember the original film, the remake offers an opportunity to revisit a beloved adventure. For newcomers, it provides an entry point into one of Doraemon’s most distinctive fantasy settings.
Animation, Music and Cinematic Experience
The 2026 movie is directed by Tetsuo Yajima, with a screenplay by Isao Murayama. Shin-Ei Animation is responsible for the production, continuing its long association with the Doraemon animated franchise.
The film explores an underwater environment that provides a different visual atmosphere from the cities, schools, and neighborhoods commonly seen in the television series.
Its ocean setting creates opportunities for dramatic lighting, enormous underwater structures, mysterious discoveries, and encounters with unfamiliar sea creatures.
In Japan, the movie also received simultaneous MX4D and 4DX theatrical screenings beginning February 27, 2026. These formats use motion effects and other sensory elements to make the viewing experience more immersive.
The combination of underwater exploration, fantasy technology, and large-scale adventure makes the film particularly suited to a theatrical presentation.
Release Date and International Availability
The movie premiered in Japanese cinemas on February 27, 2026.
It subsequently received international theatrical releases. In India, the film opened on October 2, 2026, with Hindi, Tamil, and Telugu versions, including selected 4DX screenings.
Release dates, dubbed languages, and screening availability differ by country. Viewers in Bangladesh and other regions should check local cinema listings and official distribution announcements for confirmed availability.
An international theatrical release does not automatically mean that the movie is available on a particular streaming platform. A confirmed streaming service and release date should be announced by the relevant distributor.
Why Doraemon Fans Should Watch This Movie
Doraemon has remained popular across generations because its stories combine humor, imaginative gadgets, friendship, and meaningful lessons.
New Nobita and the Castle of the Undersea Devil brings those familiar qualities into a setting filled with mystery. Its underwater civilization expands the world of the characters, while the threat surrounding the ancient castle raises the stakes beyond an ordinary school-day adventure.
The movie also explores themes of trust, cooperation, courage, and the importance of understanding people whose experiences differ from our own.
Longtime fans may appreciate the connection to the original 1983 film, while younger viewers can experience the story as a new animated adventure.
Final Verdict
Doraemon the Movie: New Nobita and the Castle of the Undersea Devil (2026) takes Doraemon and his friends into a mysterious underwater world where a camping trip becomes a mission to protect the planet.
With a familiar cast of characters, a hidden civilization, advanced gadgets, and a dangerous castle at the center of the mystery, the film revisits a classic story while introducing it to a new generation.
For fans of Doraemon, Japanese animation, and family-friendly fantasy adventures, this movie is a notable addition to the franchise’s theatrical history.
Movie status: Released in Japan on February 27, 2026. International theatrical availability varies by region.
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