Kaginado
The "KSL online 2021 -Kaginado-" event announced on Sunday that Kaginado (Key, Etc.), the first crossover anime series featuring the franchises by Visual Arts' Key brand, will premiere on television and via streaming in October. The chibi-character anime will be a crossover of some of Key's most popular visual novel and anime titles, including Kanon, Air, Clannad, Little Busters!, and Rewrite, with the anime's site promising more.
(Source: AnimeNewsNetwork)