BT21 Original Story
Japanese title: BT21 ORIGINAL STORY
Type: ONA
Source: Other
Episodes: 14
Status: Finished Airing
Aired: Sep 25, 2020 to Jan 27, 2022
Duration: 3 min per ep
Rating: G - All Ages
Genres: Fantasy, Slice of Life
Themes: Anthropomorphic

Are you all ready for more exciting stories? Like their many charms, BT21 has deep, engrossing tales yet untold...!

(Source: YouTube)