Thus Spoke Kishibe Rohan (OVA)

Thus Spoke Kishibe Rohan (岸辺露伴は動かない) is a series of adaptations of the eponymous series of one-shots, featuring Diamond is Unbreakable character, Rohan Kishibe. Much like the one-shots themselves, the episodes are released out of order.

Summary
The first OVA episode was announced on April 15, 2016 and was produced by David Production, adapting Episode 5: Millionaire Village. The promotional DVD was made exclusive to applicants who had purchased the entirety of the Diamond is Unbreakable Blu-Ray or DVD set before the deadline of July 31, 2017.

A second episode was announced on February 18, 2018, adapting Episode 2: Mutsu-kabe Hill. The disc was bundled with the second volume of Thus Spoke Kishibe Rohan, released on July 19, 2018.

On August 18, 2019, two more episodes (adapting Episode 9: The Run and Episode 16: At a Confessional) were announced. The episodes themselves were screened at select Japanese theaters starting on December 8, 2019 and were released on Blu-ray and DVD on March 25, 2020.

On October 26, 2020, Netflix announced that they had picked up the series and would be distributing it on their service as a Netflix Original during the Netflix Anime Festival. It began streaming on February 18, 2021.

On December 3, 2021, It was announced that all four episodes will be broadcasted on NHK for the first time on TV, With Episode 2: Mutsu-kabe Hill and Episode 16: At a Confessional being broadcasted on December 18, as well as Episode 5: Millionaire Village and Episode 9: The Run being broadcasted on December 20.

Trailers
On July 28, 2017, Tokyo MX aired a 60 second Promotional Video for the OVA's first episode. The next episode's Promotional Video was uploaded on February 25, 2018.

On January 14, 2021, Netflix officially released the full trailer for the OVA episodes worldwide.