JoJo no Kimyou na Bouken Part 4: Diamond wa Kudakenai

The year is 1999. Morioh, a normally quiet and peaceful town, has recently become a hotbed of strange activity. Joutarou Kuujou, now a marine biologist, heads to the mysterious town to meet Jousuke Higashikata. While the two may seem like strangers at first, Jousuke is actually the illegitimate child of Joutarou's grandfather, Joseph Joestar. When they meet, Joutarou realizes that he may have more in common with Jousuke than just a blood relation.

Along with the mild-mannered Kouichi Hirose and the boisterous Okuyasu Nijimura, the group dedicates themselves to investigating recent disappearances and other suspicious occurrences within Morioh. Aided by the power of Stands, the four men will encounter danger at every street corner, as it is up to them to unravel the town's secrets, before another occurs.

[Written by MAL Rewrite]

Kuujou, Joutarou Main

Ono, Daisuke Japanese

Kira, Yoshikage Main

Morikawa, Toshiyuki Japanese

Higashikata, Jousuke Main

Ono, Yuuki Japanese

Kishibe, Rohan Main

Sakurai, Takahiro Japanese

Nijimura, Okuyasu Main

Takagi, Wataru Japanese

Hirose, Kouichi Main

Kaji, Yuuki Japanese

Joestar, Joseph Supporting

Ishizuka, Unshou Japanese

Sugimoto, Reimi Supporting

Hara, Sayuri Japanese

Yamagishi, Yukako Supporting

Noto, Mamiko Japanese

Trussardi, Tonio Supporting

Kawashima, Tokuyoshi Japanese

Oomori, Hiroyuki Producer

Fukuda, Jun Producer

Mori, Ryousuke Producer

Kajita, Kouji Producer

Reviews

Oct 25, 2025

intertexts

Recommended

let's go eat some italian food is one of the best episodes of television ever to be produced or aired. this sentence isn't enough to count as a full review, so i am doubling down on it. i genuinely believe this. i am not being ironic. araki is one of the greatest to ever do it and i think everyone on the planet should be legally mandated to watch diamond is unbreakable episode 10: let's go eat some italian food. what i'm saying here does of course go for the rest of the season too, it's some of the best tv i've watched.

Reviewer’s Rating: 10

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Apr 7, 2025

Kyrb3ast

Mixed Feelings

Overall good jojo vibes and it kept the same style and humour it always had. The plot here wasn't strong tho, with some impactufl moments at the start and the end but the rest felt like filler. I didn't like this as much as the other parts but I watched this 3+ years after I watched part 3 lmao.

Plot: 5/10
- the start and end was good, but the rest felt rushed.
Comedy: 7/10
- classic JoJo
Characters: 6/10
- fairly average characters, I like Rohan but thats about it, I found Jouske kinda insufferable because of how immature and mean he can get.
Art: 6/10
- basic Jojo vibes
... Themes 2/10
- nothing much here, if your watching jojo for something deep, you're watching the wrong show
Personal Impact: 3/10
- I wanted dumb jojo fun, I got dumb jojo fun. It kinda felt like watching boruto tho as I wanted to see more of Joseph and Jotaro lmao
Enjoyment: 4/10
- I wanted Jojo fun and I got Jojo fun

Reviewer’s Rating: 6

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Aug 28, 2023

blizar

Not Recommended

JoJo's Bizarre Adventure Part 4: Diamond is Unbreakable is the worst part in the Jojo's franchise and one of the worst anime of all time. When I first watched this after coming off the flawed but enjoyable adventure that was Part 3 of JJBA, I expected great things as Jojo fans sing the praise of this part all across the internet. However, in Part 4, I only found utter boredom and disappointment. To explain why I feel this way towards one of the most praised anime seasons ever, let's dive into each detail, starting with the terrible and almost non-existent storyline, down to the plain ... and underdeveloped cast.

JJBA Part 4 spends the first 2/3rds of its runtime going basically nowhere, with the main cast chasing random nobodies with the most random stand abilities the author came up with on a long walk at the beach. Each episode is dedicated to fighting the random nobodies, and those fights are awfully paced and follow the same formula each time. The fights you see in Part 4 are the same as Part 3, but with nothing added, therefore making the fights worse. Each fight follows a 4-step formula similar to this:

1. Oh no, enemy stand user!
2. The hero is in trouble!
3. Aha, you thought! The villain is now in trouble!
4. Aha, you thought! The hero is in trouble!

Steps 3 and 4 keep repeating until the author decides to give the hero that extra IQ point above the villain. Yes, with a show about fighting, the fights are as boring as that.
The main villain is then introduced in the final third of the season, just to only show up every 3rd or 4th episode while the main villain's dad trolls the main cast. Seriously? Like, come on, this speaks for itself...

Alright, enough about the non-existent plot, and onto the characters. The characters aren't fleshed out, and aside from a few, most don't get any development. The characters can sometimes be funny, but that really can't save how poorly they're written. And that's all I have to say about the characters because there isn't anything to talk about here.

Ok, now for an obligatory review of the animation, so here it is. If you thought maybe the animation could save how poorly written this season was, then you're wrong because the animation is the most stiff I've seen in a Jojo's part. All fights are filled with still frames where only characters' mouths move. It's so bad that it actually pulls you out of whatever immersion there was to begin with.

Overall, JoJo's Bizarre Adventure Part 4: Diamond is Unbreakable is an extremely overrated anime that spends 2/3rds of its 39-episode runtime going nowhere, and the remaining 3rd trolling the viewer. So, if you want an anime that wastes your time with terrible animation, boring fights, and a poorly written narrative that won't take itself or you seriously, then this is for you.

Final Scorings:
Animation: 5/10 (Every fight is filled with still frames and dialogue scenes are stiff. However, the use of color in this season is very tasteful and artsy so I'll give an extra point for that)
Sound: 7/10 (Good soundtrack and fitting use of sound effects)
Story: 1/10 (Episodic fillers)
Characters: 3/10 (Extremely basic and poorly written but there a couple likeable and funny characters amidst the overly obnoxious cast)
Enjoyment: 1/10 (70% of this anime consists of nonsensical fillers)
Overall: 3/10 (Very Bad)

Reviewer’s Rating: 3

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