Based on a Japanese manga series written and illustrated by Kenichi Kondo. It has been serialized in Shueisha's Shounen manga magazine Jump Square since March 2019.
Episodes 12 and 13 received an early screening at a special event on September 24, 2023 at Ikebukuro HUMAX Cinemas in Tokyo.
Dark Gathering was released on Blu-ray in six volumes from October 18, 2023, to March 20, 2024.
The first two episodes received an early screening at a special event on June 23, 2023 at Shinjuku Wald 9 in Tokyo. The regular TV broadcast started on July 10, 2023.