Thus Spoke Kishibe Rohan (OVA)

Thus Spoke Kishibe Rohan (岸辺露伴は動かない) is an adaptation of the eponymous series of one-shots, specifically Thus Spoke Kishibe Rohan - Episode 5: Millionaire Village, featuring Diamond is Unbreakable character, Rohan Kishibe.

The OVA was announced on April 15, 2016 and was produced by David Production. The promotional DVD was made exclusive to applicants who have purchased the entirety of the Diamond is Unbreakable Blu-Ray or DVD set before the deadline of July 31, 2017.

Summary
Rohan Kishibe accompanies Kyoka Izumi, a Manga magazine editor, to a buy house at a village far off from civilization. They soon discover the village is home to a group of millionaires who had all mysteriously become rich at the age of 25. Rohan and Izumi enter one of the houses, only to realize that they are trapped by a mysterious power that won't let them progress unless they follow specific rules lest they suffer the consequences.

Gallery
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Trailers
On July 28, 2017, Tokyo MX aired a 60 second Promotional Video for the OVA.

Trivia

 * This is the first JoJo OVA to be released in over a decade, the last being the Stardust Crusaders prequel OVAs from the early 2000's.
 * Despite being released with the Part 4 anime, the OVA opts for an art style closer to the one-shot it's adapting.