On the last day of summer vacation, Nobita finds a mysterious ocarina that summons a whale named Gony, who responds to a unique 52-hertz sound. Traveling back 7,000 years, Nobita, Doraemon, and friends discover a lost island civilization and meet Pito, the ocarina’s true owner. They learn that Gony is Pito’s beloved companion and join forces with him to protect the island from a looming crisis, unraveling the mystery of the ocarina and the vanished civilization.
Gian and Suneo get a gadget from Doraemon that creates toy-sized cat robots. To counter them, Nobita makes dog robots. Soon, the cat-model and dog-model robots clash in an all-out battle, mirroring the kids’ rivalry. The fight escalates until Doraemon intervenes to stop the chaos, teaching the group a lesson about harmony and cooperation over pointless competition.
Gian shocks everyone by declaring he hates Sundays—the very day he usually enjoys forcing friends to attend his awful singing recitals. Nobita and the others are puzzled, but soon realize Gian’s family makes him study, do chores, or run errands every Sunday, leaving him no time for fun. The episode humorously shows Gian’s frustration, flipping the usual situation where his friends are the ones dreading Sundays.
Doraemon and Nobita encounter a strange alien whose body is made of dorayaki. At first Doraemon is delighted, but soon realizes the alien is in trouble and needs help returning home. Together, they protect it from danger, highlighting Doraemon’s love for dorayaki and his kind heart.
Doraemon learns that Belle is a thief going through incredible lengths to recover the blue gem, which happens to be the heart belonging to her boyfriend, stolen by Kajil. So he, Nobita, Dorami and Sewashi agree to help Belle retrieve the stolen blue gem heart, defeat Kajil, and save her fiance.
In the future, the mechanical robber Denja raids a bank and, after being captured and taken to hospital, uses a substitution trick to steal Doraemon’s body while the real Doraemon is trapped in Denja’s damaged chassis. Denja slips into the past posing as Doraemon and awkwardly ingratiates himself with Nobita and the other kids, even joining a baseball game to maintain his cover, while the real Doraemon scrambles to reach Nobita and reclaim his body. Chaos erupts when the authorities realize the escape, a frantic chase and several clashes follow, and Doraemon—powered by friendship and a repaired Time Belt—finally confronts Denja. Nobita recognizes the real Doraemon despite the disguise, Denja is exposed, apologizes, and returns the substitution rope; the police decide on rehabilitation rather than total destruction. The episode ends warmly with Doraemon’s identity restored, Denja moved by Nobita’s kindness, and a small birthday celebration that highlights friendship and forgiveness.
Nobita uses one of Doraemon’s gadgets to hide his test papers, but when they scatter into the street he blames Doraemon and they quarrel. Dorami, Doraemon’s helpful younger sister, arrives from the future and soon wins over Nobita’s family and friends by waking him for school, lending a Self-Confidence Helmet at a race, assisting with homework, and doing chores. Doraemon is called back to Sewashi, so he leaves Dorami to look after Nobita; when she later returns to fetch him because he’s unwell, the kids’ squabbles — including a fight between Gian and Suneo — are settled, and the episode closes with a bittersweet birthday moment that highlights care, responsibility, and friendship.
Today, September 3, Nobita and his friends secretly renovate Doraemon’s cluttered closet as a surprise birthday present. With Dorami’s Inventing Machine, Daito Drink, and an “anything material” box they build new tools, a massage chair, and decorations while distracting Doraemon (Suneo’s photo shoot, Shizuka’s bath salts, and Gian’s singing). The reveal goes well until the new gadgets spiral out of control and briefly explode, but the mishap is forgiven. The group moves the celebration to Nobita’s yard, Doraemon is deeply thankful, and everyone joyfully sings “Happy Birthday.”
Doraemon has been chosen to be special competitor in the Galaxy Car Race with the first prize of which is the granting of one wish for the winner. Nobita and Doraemon compete as a duo, with the former planning to wish for ears for Doraemon (who has been depressed over not having any ears) if they win. Their fiercest opponent is the dashing, handsome robot-cat racer Depon Alex, who mercilessly teases Doraemon for not having ears, but Depon may not be the one they really have to worry about.
Nobita and his friends take a train into a different dimension to escape a mysterious "Train Hunter" who is stealing people's memories. The hunter uses special devices to erase memories and steal the identities of the victims, and Doraemon must use his futuristic gadgets and knowledge of the time-traveling train's origins to defeat the hunter and save their friends.
Nobita dreams of celebrating Doraemon’s birthday at a spectacular “Airship Amusement Park,” but is scolded for not finishing his homework—until a head-poke device briefly turns him into a genius who draws the park’s blueprints. A year later Connie, the 22nd-century designer, builds the airship and brings it to the present; Nobita, Doraemon, Shizuka, Gian and Suneo ride it. Jester, head of rival Jester Land, plots a takeover, but the ship needs Nobita’s secret passcode to control it; after chaos from Jester’s clones and a dangerous hill, the plan is aborted. Doraemon suspects the code is 0209 (or 0902 — his birthday), the friends escape unharmed, and the party ends safely.
After Nina fails to guard the escaped Mong, it turns into a blue giant raccon that resembles Doraemon, which is the cause of havoc in the town. Mong goes inside Doraemon. Nina tries to catch Mong by freezing Doraemon which will break Doraemon. Will Nobita and friends save Doraemon?
Nobita skips his summer homework and uses Doraemon’s What-If Phone Booth to create a world where nobody scolds—so happy Nobita stays lazy while Doraemon discovers scolding has been outlawed in the future. When Doraemon and a robot teacher, Ikkoku, are arrested for a temper incident, they’re sent to an offshore prison run by the diamond-obsessed Majime and superintendent Donpa. Nobita, Dorami and friends sneak into the past/present prison using Doraemon’s spare 4D pocket, free Doraemon and the inmates, and withstand ant-robot guards and Majime’s giant statue. With gadgets like the Genius Helmet and Technical Gloves, they defeat Majime, restore the stolen What-If Phone Booth, and return everything to normal—just in time to celebrate Doraemon’s birthday.
For Doraemon’s birthday, Nobita surprises him with a ticket to the 22nd-century Funny Castle, a magical sweets studio where the prize Dream Dorayaki Cake is made by mechas using recipes on the spinning Ocasic Record created by pastry genius McCarron. Inside, an upset usher named Candy reacts badly when he learns Doraemon is a cat-shaped robot, and Nobita uses an Inanimate Baton to miraculously restore a toppled macaron tower. Inspired, Candy rushes off clutching a record—but soon Gian, Suneo and even Shizuka vanish and eerie duplicates appear. Strange glitches erupt throughout the castle, and Nobita must unravel the mystery to save his friends in a sweet-but-perilous adventure.
Nobita, after hearing about treasures in Egypt, uses Doraemon’s gadgets to search for them but accidentally drops his future diary. He and Doraemon rescue Nemses II, a young pharaoh trapped by a traitor, and learn that his kingdom and princess are in danger. Along with Shizuka, Gian, and Suneo, they travel back to ancient Egypt, only to discover that the villain Warueheb has seized power using Nobita’s lost diary. Now, the friends must help Nemses reclaim his throne and restore peace to Egypt.
Suneo, after getting good test scores, tries to use his newfound confidence to get back at Gian and Nobita. He decides to help them and uses some of Doraemon's gadgets, but then he accidentally sends them into an other world where he can learn about the world, according to the summary. He uses the gadgets to gain the attention of the insect-like humans and then tells them about the planet's history. After this incident, Doraemon and his friends get together with the insect-like humans to go and find the other world, where he can learn about the world.
Doraemon and his friends travel back 2,500 years to ancient Athens using the Time Machine, where they disguise themselves with the Dress-up Camera and use a Translation Tool to explore. After hearing a poet sing about the Minotaur legend, Nobita becomes frightened, but Doraemon reassures him it’s only a story. While following a delicious smell, they discover the world’s oldest cake, but Nobita accidentally pulls the Time Machine lever and ends up 1,000 years earlier, where he is captured by soldiers. Doraemon, Shizuka, Gian, and Suneo use a Time Belt to rescue him, flying with Take-copters toward Crete to continue their adventure.
Doraemon and his friends set out to find the Sky Castle’s hidden treasure after uncovering clues that point the way. They come across a diary/blueprint that reveals part of the route and pushes the group deeper into the mystery. As they prepare and travel, they face strange obstacles—animated snowmen and short, tense skirmishes among them. The team bands together to protect their town, balancing moments of courage with lighthearted, supportive interactions. The episode closes with new clues in hand but the castle’s true secret still unresolved, leaving the friends determined to continue the search.