Doraemon: Castle of the Undersea Devil Review: Story, Animation & Rating (2026)

October 6, 2026 3 Min Read

Doraemon: Castle of the Undersea Devil Review :Doraemon: Castle of the Undersea Devil brings Nobita and his friends back for another big-screen adventure, this time taking them deep beneath the ocean. The film mixes fantasy, comedy and emotional moments while staying close to the familiar charm that has made the Doraemon franchise so popular.

Story

The adventure begins when Nobita, Doraemon, Shizuka, Gian and Suneo find themselves caught up in a mysterious underwater journey. What initially feels like an exciting exploration soon turns into a much bigger mission involving an ancient underwater world and a threat that could affect both humans and the ocean kingdom.

As the group travels deeper into the sea, they encounter strange creatures, hidden secrets and unexpected challenges. Nobita, as usual, finds himself at the centre of situations that are much bigger than he expected.

The story follows a familiar Doraemon formula—an imaginative setting, futuristic gadgets, friendship, danger and a message about courage and responsibility. While some parts may feel predictable to longtime fans, the underwater setting gives the movie enough freshness to keep the adventure engaging.

Animation and Visuals

The underwater world is easily one of the film’s biggest attractions. The animation creates a colourful fantasy environment filled with mysterious locations, sea creatures and large-scale action sequences.

The movie also makes good use of Doraemon’s futuristic gadgets, which add plenty of fun to the adventure. Younger viewers will particularly enjoy the visual spectacle, while longtime fans may appreciate the nostalgic feel of seeing the classic characters in a new setting.

Characters

Doraemon remains the heart of the story, but Nobita once again gets plenty of room to grow. His fear and insecurity are balanced by moments of bravery when his friends need him the most.

Shizuka brings her usual warmth to the group, while Gian and Suneo provide much of the comedy. Their friendship continues to be one of the strongest elements of the franchise.

What Works

The biggest strength of Doraemon: Castle of the Undersea Devil is its ability to combine a simple children’s adventure with themes of friendship, courage and protecting nature.

The underwater setting also gives the film a different flavour compared with many previous Doraemon adventures. The humour keeps the story light, while the emotional moments add some depth toward the finale.

What Doesn’t Work

The screenplay occasionally follows a predictable path, particularly for viewers who have watched several Doraemon movies. Some characters and story developments could also have received more attention.

However, these shortcomings are unlikely to bother the film’s core audience, especially younger viewers and longtime Doraemon fans.