Day of the Carnival, Etc.
The Kaginado Academy Carnival begins! The space-time continuum is completely ignored to allow several miraculous encounters.
Aired 22/12/2021EP 11 - Day of the Carnival, Etc.

2021
KAGINADO
Laughs and shenanigans are on the horizon in this crossover! Fan-favorite characters from Kanon, Air, Clannad, Little Busters!, Rewrite, and more start the school year together in a new world where anything is possible. With so much personality in one anime universe, every day feels like a new kind of dream.
(Source: Funimation)