Burn The Witch PV

BURN THE WITCH is a one-shot manga by Tite Kubo released in the July 16th, 2018 edition of Shonen Jump, detailing a day in the lives of two witches working for the Western Branch of Soul Society, located in Reverse London.

Roadshow 2 October 2020 in Japan. Amazon Prime Video and Hikari TV will also be streaming the anime in Japan. There'll be edit version of the movie that have a few differences.
They also confirmed it will be streamed worldwide, but did not specify which services will stream the anime outside of Japan.

You can read the new 4 chapters manga legally here https://mangaplus.shueisha.co.jp/titles/100113