Doraemon: Nobita and the New Castle of the Undersea Devil Trailer Plunges Fans Into 2026's Epic Deep-Sea Remake

The 45th Doraemon feature film, officially titled Eiga Doraemon: Shin Nobita no Kaitei Kiganjo (Doraemon: Nobita and the New Castle of the Undersea Devil), has unveiled its debut trailer. This highly anticipated movie is scheduled for a Japanese theatrical release on February 27, 2026. The film serves as a modern reimagining of the beloved 1983 classic, promising to merge the original's cherished nostalgia with contemporary animation and narrative depth.

Guiding this ambitious project is Director Tetsuo Yajima, known for his directional work on Pokémon the Movie: Secrets of the Jungle and his extensive contributions to the broader Doraemon franchise. Under his vision, the audience is plunged into a visually rich deep-sea realm. The screenplay is penned by Isao Murayama, a seasoned writer and composer recognized for his involvement across multiple Precure series, who skillfully combines high-stakes adventure, signature comedy, and profound emotional beats.

The preview footage showcases the iconic quintet—Doraemon, Nobita, Shizuka, Gian, and Suneo—as they embark on an aquatic camping trip. They utilize ingenious futuristic tools, including the adaptation light and the charmingly anthropomorphic Underwater Buggy, to navigate the submerged environment.

The central conflict ignites when the group stumbles upon the concealed civilization of Mu. This discovery quickly escalates into a global crisis involving the advanced, robotically governed realm of Atlantis. A powerful supercomputer named Poseidon erroneously interprets volcanic activity as a hostile invasion and initiates plans to deploy nuclear weapons against the surface world. The ensuing narrative thrusts the heroic friends into a desperate race against time to avert this global catastrophe.

Along the way, the friends navigate breathtaking submerged landscapes, explore ancient ruins, and encounter enigmatic marine life. A notable addition to the cast is the new character, Eru, a young member of the Mu civilization, who introduces fresh dynamics to the core themes of friendship and courage central to the Doraemon legacy.

The trailer expertly highlights the film’s dual appeal: the infectious, light-hearted humor generated by Doraemon’s unpredictable gadgets, balanced by Nobita’s personal growth, specifically his valiant effort to overcome his deep-seated fear of the ocean. Visually, the film features majestic coral palaces, vibrant schools of fish, expansive submerged ruins, and the sinister silhouette of the Devil Castle, promising a suspenseful adventure.

Adding to the production’s artistic merit, the Japanese rock band sumika is confirmed to perform the theme song, "Honto." With animation consistency assured by Shin-Ei Animation, the studio behind countless Doraemon successes, fans can expect top-tier quality. Furthermore, the voice cast sees exciting additions, including Shōya Chiba voicing El, a soldier from the Mu Federation, and Ryō Hirohashi lending their voice to the lively Underwater Buggy.