Tamagotchi: The Movie

Tamagotchi The Movie ? , Eiga de Tj Tamagotchi Dokidoki Uch no Maigotchi?? , lit. Appearing on Film Tamagotchi HeartThrobbing Lost Child In Space? is a 2007 Japanese animated film produced by OLMs Team Kamei division. It is the first Tamagotchi feature film ever produced, officially based on the digital pet franchise jointly created by Bandai and WiZ. It is directed by Jji Shimura of Pokmon and written by Aya Matsui of Boys Over Flowers and was released in theaters by Toho on December 15, 2007, and on DVD on July 23, 2008 in Japan.

One day, Mametchi and Tanpopo stay home. Papamametchi gives Tanpopo a key that will take her back to the time when she was forwarded to Tamagotchi Planet. After several more events, the egg bounds out the window, rolls down the street, and eventually falls into a bundle of balloons that end up caught on the top of One Tower. Soon all of Tamagotchi Planet is watching Mametchi try to save the egg. Mametchi, Tanpopo, and Memetchi are all trying to save Mametchis younger sibling, and Kuromametchi saves all three of them, using Kuchipatchi as a trampoline.Soon, the egg hatches into Mametchis sister, Chamametchi. A montage of events follow, as Chamametchi grows to kindergarten age, while Mametchi finally succeeds in creating Mamesunnitchi, a little sun that will follow Mametchi everywhere and always provide him with light. The real Tamagotchi Planet sun, Sunnitchi, witnesses this. Soon after, the rocket for Tanpopo is complete. Mametchi says he wants Tanpopo to stay for the birthday celebrations for the King, and both Tanpopo and Mametchis parents agree. ........

Source: Wikipedia