Doraemon Movie 13: Nobita to Kumo no Oukoku
English title: Doraemon the Movie: Nobita and the Kingdom of Clouds
Japanese title: 映画 ドラえもん のび太と雲の王国
Type: Movie
Source: Unknown
Episodes: 1
Status: Finished Airing
Aired: Mar 7, 1992
Duration: 1 hr 40 min
Rating: PG - Children
Studios: Shin-Ei Animation
Genres: Adventure, Comedy

During class, Nobita questions the teacher where heaven is located when he was being taught about clouds. Being laughed at, Nobita looks for proof that a heavenly place exists on the clouds, but was explained by Doraemon that it cannot exist scientifically. Disappointed, he was eventually helped by Doraemon to create their own kingdom of clouds. Little did they know that there are creatures who have been living on clouds for a long time. 

(Source: ANN)