The upcoming miniseries featuring characters from Key called Kaginado will premiere on October 12th.
Originally announced earlier this year, the series appears similar to another crossover series Isekai Quartet which features isekai protagonists in a non-canon comedy setting.
Key is known for their original visual novels (many of which have gone on to become anime series) such as Clannad, Air, Little Busters, and Kanon.
Anime “KAGINADO” Website Updated!https://t.co/G7IrHJm08g
— KeyミニキャラTVアニメ「かぎなど」公式 (@kaginado) September 24, 2021