Tamagotchi: Happiest Story in the Universe!

The ship touches down at Tamagotchi School and opens its doors to Mametchi, Kikitchi, and their classmates. The students board the ship and begin exploring a collection of magical storybooks on board. Kikitchi appears sad as he watches the others prepare for adventures.

Mametchi conceives a plan to brighten Kikitchi's mood and shares it with the group. He leaves Tamagotchi School the next day to work on the project, determined to spark joy among his friend.

The project explodes in a pink cloud, but Mametchi manages to create Hapihapitchi. Hapihapitchi has the power to absorb happiness and spread it to others.

The group celebrates the creation of Hapihapitchi and spots an advertisement for Celebria. They decide to visit Celebria later, hoping the trip will bring more joy to their friends.

Kikitchi is shown at home alone, eating a meal while watching a TV interview with his parents, the creators of Celebria. The scene underscores his loneliness and longing for companionship.

Mametchi and Hapihapitchi start gaining fame for using Hapihapitchi's powers to make everyone in Tamagotchi Town feel cheerful. The town's mood grows buoyant as residents begin to expect Hapihapitchi's influence.

While dining at Celebria's McDonald's, Mametchi and friends spot Kikitchi eating alone. They invite him to join, but he runs away; they chase him and try to cheer him up with Hapihapitchi's powers, though he resists being forced to be happy.

Mametchi realizes that Tamagotchi Town's residents have come to rely on Hapihapitchi for happiness rather than solving their problems. He tells Hapihapitchi not to use her powers, hoping to restore balance.

The ship returns to Tamagotchi School and the friends enter a book called The World's Happiest Story, following the misadventures of a man named Happy who seeks happiness through wealth. They try to help him, but he flees.

Kikitchi brings the book home and enters it. With the last page missing, the book becomes unstable, and a sudden paper tornado engulfs Celebria, turning people into two-dimensional paper figures.

Mametchi and friends ride the Magical Flying Library Ship into the tornado to craft a new ending for Happy's story. They realize that true happiness comes from connection with others.

Hapihapitchi uses her powers to grant Happy all the happiness in Tamagotchi Town and reminds him of fond memories of his dog Lucky. The shared memories help him understand the value of companionship.

Mametchi and friends craft a new ending where Happy and Lucky are reunited, ending the paper tornado and restoring Tamagotchi Town to its normal state. The town celebrates the restored happiness and harmony.

Hapihapitchi almost dies from exhausting her happiness reserves, but Happy rescues her and expresses gratitude, reviving her with his appreciation.

Back in Tamagotchi Town, Kikitchi is reunited with his parents. They hug him and promise to spend more time together, signaling a stronger family connection.