Mametchi and his friends spend their time traveling into storybooks at the library. They come across a book called "The World's Happiest Story", which is about a character named Happy who is trying to get, well, happy, and eventually it's revealed that a page is missing from the book. Their friend Kikitchi jumps into the book, which is enough to affect Tamagotchi Planet as well as the world in the story, forcing Mametchi and friends to save the day.
Cartoon Network aired an English dub in the Philippines.
Succeeded by Tamagotchi.
This film contains the following tropes:
- Aimlessly Seeking Happiness: The characters enter the world of the book The World's Happiest Story, starring a character named Happy whose one goal is to find happiness. Problem is, not only has every attempt he's made - including stuff like becoming rich and learning lots of magic spells - failed, but the page containing the end of the story has been ripped out, so Mametchi and his friends have to write a happy ending for him. Near the end of the film, he finally comes to the conclusion that being with friends is the true meaning of happiness, which is enough to revive Mametchi's pet Hapihapitchi who had died from using up too much happiness energy.
- Astronomic Zoom: In the intro, the shot cuts from an outer space view Tamagotchi Planet to Tamagotchi School and the camera moves backwards as the narrator introduces a bunch of Tamagotchis before zooming out, back to an outer space view of the planet.
- Banana Peel: Kikitchi throws banana peels onto the ground to make Memetchi and Makiko slip due to him being jealous about their interest in the magical books.
- Big "SHUT UP!": Kikitchi says this to Hapihapitchi after she fails to make him happy.
- Continuity Nod:
- Disney Death: Near the end of the film, Hapihapitchi runs out of happiness to absorb and dies. Then Happy says he's the happiest man alive, which revives her.
- Giant Food: One of the storybook worlds is filled with this.
- Magic Carpet: During the opening credits, Chamametchi visits a book where she is an Arabian princess and is seen on a flying carpet.
- Market-Based Title: The French dub of the film is renamed Tamagotchi le film ("Tamagotchi: The Movie"), since the preceding film that actually is called Tamagotchi: The Movie never released in France.
- The Movie: The second movie to be based on Tamagotchi.
- Non-Indicative Name: Happy is not actually happy, but he's trying. This changes by the end of the film, of course.
- Paper People: The various Tamagotchis on Tamagotchi Planet are flattened into literal walking pieces of paper as a result of Kikitchi deciding to visit "The World's Happiest Story" and causing Tamagotchi Planet to slowly turn into a storybook.
- Portal Book: The Tamagotchis are shown traveling into books in this film. In fact, it's a central plot point - they have to help Kikitchi get back to the real world from "The World's Happiest Story".
- Product Placement: While they are at the Celebria amusement park, Mametchi and his friends eat in a food court and are seen with drinks bearing the McDonald's logo.
- Save Both Worlds: Mametchi and friends must save both Tamagotchi Planet and the world in "The World's Happiest Story".
- Show Within a Show: A book within a film, more like. "The World's Happiest Story" was invented specifically for this film.
- The Stinger: The film has a post-credits scene where Mametchi and his friends are eating some heart-shaped fruits together and then decide to visit a new storybook that has been added to the Flying Library.
- Trapped in Another World: Kikitchi gets himself trapped in "The World's Happiest Story", and Mametchi and friends must rescue him.