Little Twins: Bokura no Natsu ga Tondeiku
Japanese title: リトルツインズ ぼくらの夏が飛んでいく
Alternative titles: Tiffel & Taffel, Tiffel and Taffel, Tiffel & Tuffel, Tiffel and Tuffel, How Our Summer Flew Past
Type: Movie
Source: Unknown
Episodes: 1
Status: Finished Airing
Aired: Aug 8, 1992
Duration: 25 min
Rating: G - All Ages
Studios: Toei Animation
Producers: Hero Communication
Genres: Adventure
Demographics: Kids

The length and quality suggests this movie was the fourth video installment, dumped on theaters as a promotional exercise for the tapes.

(Source: The Anime Encyclopedia)