Part 4: Diamond is Unbreakable



Part 4 of JoJo's Bizarre Adventure, subtitled Diamond is Unbreakable, is preceded by Part 3: Stardust Crusaders and followed by Part 5: Golden Wind. Josuke Higashikata is the main JoJo of this part and Yoshikage Kira is the main antagonist. Enemy Stand Users serve as the villainous faction for this part.

This is the second part to incorporate Stands after Part 3, and introduces the Stand Arrow, which is comes more important in the following two parts.

Originally titled JoJo's Bizarre Adventure: Part 4: Jousuke Higashikata, the manga first released in Weekly Shonen Jump in 1992.

In 1999, a one-shot titled Dead Man's Questions released in Sheisha's Allman magazine was released. It told the story of the ghost of Yoshikage Kira wandering throughout the afterlife trying to find a purpose, unaware of the life that he previously led.

In 2007 a non-canon light-novel titled The Book: 4th Another Day was released written by Otsuichi and illustrated by Hirohiko Araki. It served as a sequel to Part 4 that takes place two years after in 1981. It was released to commemorate the series 20th anniversary.

Diamond is Unbreakable was adapted into a TV anime as the third season of JoJo's Bizarre Adventure: The Animation in 2016.

In July of 2017 a film adaptation of Part 4 was released. It adapts the first few arcs of Part 4 and ends with a cliffhanger, omitting several characters and plot points.

The Part 4 manga was officially released in the United States from 2019 - 2021.

Official Description
In 1999 in the town of Morioh, Josuke Higashikata and his friends uncover the mysteries of their small town, fighting fellow Stand Users like themselves, and eventually taking down their town's local killer, Yoshikage Kira.

Plot Summary
The fourth part is set in 1999 in the fictional city of Morioh Japan, and follows Joseph Joestar's illegitimate son, Josuke Higashikata. The story revolves around the mysteries of the small town that Josuke and his friends inhabit, as well as discovering the truth about the Stand Arrow and how it tempts the people of Morioh. Josuke and his friends also track down the illusive murderer, and Stand User, Yoshikage Kira. The story ends at Yoshikage Kira's defeat, and the golden heart of Morioh being preserved.

Characters

 * Josuke Higashikata - Billy Kametz
 * Okuyasu Niijmora - Jalan K. Cassell
 * Koichi Hirose - Zach Aguilar
 * Rohan Kishibe - Vic Mignogna
 * Jotaro Kujo - Mathew Mercer
 * Yoshikage Kira - D.C. Douglass

Other Stands

 * The Book (4th Another Day)
 * Memory of a Jet (4th Another Day)
 * Nijimura Father's Stand

Songs

 * Crazy Noisy Bizarre Town
 * Crazy Noisy Bizarre Town (EDM Version)
 * Chase
 * Great Days

The Book: JoJo's Bizarre Adventure 4th Another Day
A non-canon light novel written by Otsuichi in 2007 set one year after the events of Part 4. The novel follows four different perspectives, ranging from Koichi Hirose's perspective, the perspective of Takuma Hasumi the main antagonist of the book, Akari, Takuma's mother, and Chiho Futaba who is Takuma's best friend/sister. The book features two original Stands created by Otsuichi, The Book and Memory of a Jet. It is non-canon but it does not conflict with the existing timeline so it very well could be canon.

Thus Spoke Kishibe Rohan (one-shots)
Starting in 2013, Hirohiko Araki began writing several one-shot chapters telling mini side stories from the perspective of Part 4 character Rohan Kishibe. They are canon to the JoJo timeline, as they are written entirely by Araki and fit into the plot.

Chapters for this series go as follows:


 * Episode 16: At a Confessional


 * Episode 2: Mutsu-kabe Hill
 * Episode 5: Millionaire Village
 * Episode 6: Poaching Seashore
 * Kishibe Rohan Meets Gucci
 * Episode 4: The Harvest Moon
 * Episode 7: A Rainy Monday
 * Episode 8: Deoxyribonucleic Acid
 * Episode 9: The Run

The chapters are listed as "episodes" and release out of order. Because the highest numerical value for the chapters goes up to 16, it is implied that there may be at the very least 8 more chapters to be released that take place before At a Confessional. The only one of these chapters that is not confirmed to be canon to the JoJo timeline is Kishibe Rohan Meets Gucci.

Rohan at the Louvre
Another addition to the Rohan saga, this is a non-canon story that acts as promotion for Araki's artwork being shown at the Louvre in Paris. It tells the story of Rohan visiting this art museum and discovering some dark secrets about some of the contents in this facility. It is confirmed to be non-canon because it conflicts with the information already provided to us in the official JoJo lore.

Thus Spoke Rohan Kishibe (OVA)
Starting in 2016 a couple of the one-shot chapters for TSKR began being adapted into an OVA by David Productions.

Thus Spoke Kishibe Rohan Short Story Collection
A light-novel of a group of short stories written in the style of the Thus Spoke Rohan Kishibe series.

Dead Man's Questions
A canon sequel to Part 4 written by Hirohiko Araki showing what happens to Yoshikage Kira after his death. He becomes a ghost that lost his memories as he tries to find his true purpose in the ghost world.

JoJo's Bizarre Adventure: Diamond is Unbreakable (Film)
A direct live-action film adaptation of Part 4 based on the first half of the arc. It ends at the confrontation with Keicho in the Nijimura Household, with minor differences in the lot. Instead of Keicho being killed by Red Hot Chili Peppers, he is killed by Sheer Heart Attack and the Stand Arrow is stolen from him.

Thus Spoke Kishibe Rohan (Live-Action Drama)
Another live-action adaptation, this time of three Thus Spoke Rohan Kishibe stories: Kushagara (novel only,) Millionaire Village, and D.N.A.

Diamond is Unbreakable Drama CD Collection
From 2016 to 2017, two sets of CD drama collections were released in collaboration with JoJo's Bizarre Adventure: The Animation Season 3: Diamond is Unbreakable. The two sets tell two original stories set in the town of Morioh during the plot of Part 4, and all of the voice actors from the Part 4 anime return to reprise their roles.

The first of the two sets tells the story of Josuke, Koichi, and Okuyasu investigating a ghost story in their high school, which ends up merely being Toshikazu Hazamada playing a prank on them with his Stand, Surface.

The second set is about Koichi and Josuke trying to help Okuyasu build up the nerve to ask out a waitress that he thinks is cute at Café Deux Magots

Trivia

 * In this part the Stand Arrows are introduced. It is explained that this is how DIO awakened his Stand, and we know this because Joseph uses Hermit Purple to uncover an image of Enya holding the Stand Arrows.
 * The Stand Arrow is added into the background of a scene in the Stardust Crusaders anime so that this explanation makes more sense.
 * We are shown three different Stand Arrows existing in this world in this part and the one before. The one that belonged to the Nijimura brothers, the one that belonged to Yoshiro Kira, and the one that was in the hands of Enya the Hag.