MadMan was planning on translating it to English, but they never revealed an English release date. However, an English dub exists (although it is very rare) and has been aired on television it some countries such as the Philippines.
At Tamagotchi School, the Tamagotchi children wait for the flying library to arrive. While talking about the kind of books they would like to read, another young student adds a rude comment to Mametchi's dream. Chamametchi recognizes him as Kikitchi, a new student in her class. Mametchi then explains to Kikitchi that the flying library is a flying ship that contains magical books that children are magically transported into and made the main character when they read them. Just then, Kikitchi's sensitive hearing picks up the sound of the ship's horn. Although no one else can hear it, the ship appears after a minute. The Otogitchi Siblings, who take care of the library, bring the ship down, and let down a flight of stairs, which the Tamagotchi children eagerly climb up.
Down in the library, the children eagerly grab various books and open them, which causes various objects to pop out. The Tamagotchi children then jump into different books, causing them to transport into the story. The title theme then plays as the Tamagotchi go on their various adventures inside their stories. Chamametchi flies on a magic carpet to a castle in the sky; Mametchi relaxes on a machine in the ocean, which he then goes into and flies away into space in; Memetchi goes to an elegant party in a castle and meets a prince, which she and Makiko fight over; Kuchipatchi eats endlessly in a land made entirely out of candy; and various other Tamagotchi children dance and fly in other lands of music and letters. The last person to be seen is Kikitchi, who sits on a leaf alone looking at the sky. Next to him, his scarf has been taken off, showing he has no interest in the story he is in.
After the children exit their stories and are starting to leave the library, Kikitchi hears a small voice calling out for help. However, due to the fact that he can hear smaller sounds than others, no one else can hear it, and tell him he must be hearing things. As Kuchipatchi, Mametchi, Memetchi, and Chamametchi tell about what happened while they were in their stories, Makiko and Memetchi get into an argument over the prince that had been in their story. As they are walking, Kikitchi makes them fall by throwing banana peels in front of them. As he laughs, Memetchi asks him if he enjoyed his story. He responds that he didn't like it at all.
Meanwhile, Mametchi has an idea for an invention, and he rushes home. After several failed attempts, he finally gets his experiment right, and he invites his friends over to watch him complete it. But after several events, the experiment goes wrong, and a small creature emerges. Mametchi explains that he did not expect his experiment to become and actual living thing, but that the creature can absorb the feelings of others and use it to make other people happy. Mametchi decides to call his new creature "Hapihapitchi".
While the birth of Hapihapitchi is being celebrated, Kikitchi eats a large meal on his own. He is full after one bite, and turns on his TV. He sees an advertisement for Celebria, a newly completed super-shopping mall. Kikitchi's parents then appear on TV, explaining that they built Celebria as a place where all Tamagotchis could go to have fun. Kikitchi sadly turns off the TV, and watches fireworks from outside his window.
Hapihapitchi begins to use her power to make people happy. She attempts to use her power on Kikitchi, but Kikitchi runs away, yelling that forcing people to be happy is "nonsense". Over time, Mametchi begins to notice that Hapihapitchi is actually making people unhappy; they now depend on Hapihapitchi to make them happy when they are upset. Mametchi then tells Hapihapitchi not to use her powers on anyone until he can figure out what to do.
At school, the flying library comes again. Kikitchi, who is hiding in a corner, hears the small voice calling out for help again, and begins to search for the source. Hapihapitchi also senses the unhappiness that is connected with the voice, and she begins to search for the source, too. As Kikitchi, Mametchi, Memetchi, Kuchipatchi, Chamametchi, and Hapihapitchi run into each other, a book opens up at their feet, entitled "The World's Happiest Story". They enter the book, where they notice that, unlike the other magical books in the library, they don't become the main character. The story tells of a man named Happy who lived with his dog named Lucky. Because his name is "Happy", he is determined to become the happiest man in the world, so he sets off on a journey, leaving behind his home and his dog. He becomes rich and a hero, but he still isn't the happiest man in the world. The characters find Happy, but he states that he doesn't want their help. As the Tamagotchis follow Happy through the various pages of the story, they notice that the story loops; the end simply brings them back to the beginning. Kikitchi notices that Happy acts similar to how he acted, and he begins to feel bad. However, before the Tamagotchis can help Happy, the school bell rings, and they have to leave the library. Unknown to anyone else, Kikitchi leaves the Library, the book with him.
Back at his house, Kikitchi remembers an event that occurred when he was younger. A group of younger Tamagotchis were talking about a festival that was to occur the next day, but Kikitchi hears a tree say that it will rain tomorrow. When he tries to tell the others, the children call him a liar and a horrible person. Unable to wait, Kikitchi enters the book he has taken home. As he does, however, a tornado of paper engulfs Celebria, and causes the Tamagotchi caught in the tornado to become two-dimensional. Mametchi's family sees the news report on TV, and Chamametchi and Mametchi instantly think of Kikitchi. The family then heads to Mame Laboratories to discuss the problem with other scientists.
At the laboratory, one of the scientists explains that the last page in Happy's story had been torn out, so that he is unable to complete his story. Over time, the book had become unstable, and Kikitchi entering the story caused it to become unstable enough to affect the real world. The only way to save the world was to have Otogitchi, the captain of the flying library, write a new ending with a magic crayon. Meanwhile, Papamametchi reluctantly allows Mametchi and his friends to enter the story to save Kikitchi.
Mametchi and his friends enter the book on the flying library ship. In the book, Kikitchi is talking with Happy, who is beginning to believe he will never be happy. The flying ship finally finds them, where Otogitchi explains to Happy that they have to write a new ending to the story. They attempt to write several different endings, but they all disappear, meaning that they aren't correct. When he begins to become discouraged, the other Tamagotchi begin to give him ideas of what makes them happy. Kikitchi's idea, which is when someone says "hello" to him during class, has a large impact on Happy, and he begins to get an idea. Unfortunately, the world inside the story begins to fall apart, and the magic crayon is accidentally dropped. Since Happy states that he can't leave the book with the other Tamagotchi, Hapihapitchi asks Mametchi if she can try to make Happy happy. Happy is surrounded with memories, and he finally decides how he wants his story to end. Kikitchi risked his life to get the magic crayon back, and he asks Happy what he wants the ending to be. Happy says that he wants to go back to his home as it was before he left. Otogitchi's sister draws a door, and Happy opens it; suddenly, the book stops disintegrating, and returns to normal. Kikitchi realizes that Lucky was the one calling out to him, and is happy that Happy is now happy.
Suddenly, Hapihapitchi collapses in a field. Mametchi explains that without any happiness, Hapihapitchi would die. Hapihapitchi gets up and weakly sprinkles her last happiness over Kikitchi, stating that she promised she would make him happy. Kikitchi begins to cry, and Mametchi tells everyone that Hapihapitchi needs happiness to absorb, but no one can be happy while Hapihapitchi is about to die. Happy approaches Hapihapitchi, picks her up, and tells her that he is the happiest man in the world. Suddenly, Hapihapitchi's health is restored, and she springs back to life and Kikitchi stops crying but is still sad. The Tamagotchi wave goodbye to Happy and Lucky, and leave the book on the flying ship.
Back in the real world, the citizens of Tamatown celebrate the return of the heroes. Kikitchi's parents comfort him, by promising to make more time for him from now on. Happily, Kikitchi introduces his parents to his new friends.
The end credits show Tamatown being cleaned up after the paper tornado, and the Tamagotchi children continuing to enjoy the magical story books. A picture inside the wall of Mametchi's home also shows a brief picture of Tanpopo, the main heroine from the first Tamagotchi film.
Main article: Kikitchi
A new stubborn but lonely student at Tamagotchi School, with big ears that can hear everything around him.
Main article: Hapihapitchi
Main article: Otogitchi
The owners of the Magical Flying Library Ship.
Main article: Happy
The main character and hero in the World's Happiest Story book.
Main article: Lucky
Songs featured in the movie
Name in Other Languages
Japanese: 映画! たまごっち うちゅーいちハッピーな物語!?
Chinese: 塔麻可吉 宇宙第一的快乐物语!?
French: Tamagotchi: Le Film! La Plus Belle Histoire de L'Univers