Digimon Adventure: 20-shuunen Memorial Story
English name: Digimon Adventure: 20th Memorial Story
Genres: Adventure, Drama
Type: ONA, Episodes: 5
Aired: Nov 22, 2019 to Dec 25, 2020
Studio: Toei Animation
Source: Original
Rating: G - All Ages
Synopsis:
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)