Digimon Adventure: 20-shuunen Memorial Story
English title: Digimon Adventure: 20th Memorial Story
Japanese title: デジモンアドベンチャー20周年メモリアルストーリー
Alternative titles: To Sora
Type: ONA
Source: Original
Episodes: 5
Status: Finished Airing
Aired: Nov 22, 2019 to Dec 25, 2020
Duration: 6 min per ep
Rating: G - All Ages
Studios: Toei Animation
Genres: Adventure, Drama

A crowdfunding campaign opened for the "Digimon Adventure Memorial Story Project." It was for 5 shorts that included a prequel of the upcoming film and side stories about the daily lives of the Digimon characters and their partners, which are stories that did not make it into the film. 

The campaign was successfully backed.

(Source: ANN)