Ayashimon Review: The Manga Hero Who Walked Into a Yokai Yakuza War

When I was a kid, the manga heroes I read about felt more real to me than the kids who ignored me at school. Goku, Saitama — I genuinely believed if I trained hard enough, the world would eventually hand me a villain worth fighting. It never did, of course. That's the part nobody tells you: you can become strong and still never find a reason for it.

That ache is exactly what Maruo Kaido, the hero of Ayashimon, is carrying when the story opens. He's an ordinary human who trained himself by copying moves out of his favorite manga until he could break rocks at seven years old — but he's spent his whole life unable to find an opponent who can survive a punch. The opening pages of this short, doomed little series understood that feeling so precisely that I kept reading even after I knew it had been cancelled.

Quick Take

• A fast, fun 3-volume Shonen Jump action manga from Yuji Kaku, the creator of Hell's Paradise (Jigokuraku).
• The premise — a manga-obsessed human muscling his way into a yokai-run yakuza underworld — is brilliant, but the series was cut short at 25 chapters and ends on a cliffhanger.
• Age rating: T (Teen) — yakuza violence and supernatural brawling, but nothing graphic.

Story Overview

Maruo Kaido grew up worshipping manga heroes and trained his body to match them, only to discover that real life has no boss fights. Then he runs into Urara — a small girl who is actually an ayashimon, an oni (demon) yokai that can shapeshift into human form. She's being hunted through Tokyo by a gang of ayashimon yakuza, and Maruo, who has never met anyone his strength couldn't flatten, wades in and beats the whole gang without breaking a sweat.

Urara is stunned — not that he's strong, but that he's a plain human doing this. She recruits him on the spot as the founding member (and bodyguard / "right-hand man") of her brand-new yakuza organization. Her goal: claw her way to the top of Kabukicho's hidden underworld, a Shinjuku night-district run entirely by ayashimon who use organized crime as their social structure. Maruo signs on because, to him, this is the dream — finally getting to live as a manga protagonist, walking the yakuza road against monsters who can actually take a hit.

From there it's a ladder of escalating gang conflicts: a brutal duel with Kotton, the leader of the Todoroki Alliance eventually swearing loyalty to Urara, and a wild battle against the Kori Hotels faction packed with tanuki and kitsune yokai. By the end, the real wall comes into focus: Doppo Akari, whose strength and skill are on a terrifying level above everyone else, and who holds Kabukicho — the territory Urara needs. The series ends right as Maruo and Doppo are about to clash. The fight never happens. Kaku was cut off before he could deliver it.

Characters

Maruo Kaido — The heart of the whole thing. He's not a brooding chosen one; he's a sincere manga otaku who took shonen literally and trained himself into a monster, then spent years lonely and aimless because the world gave him nothing to swing at. His arc across three volumes is watching a one-punch wrecking ball slowly learn to actually fight — by the final volume he's figuring out how to handle fire and how to scrap with yokai instead of just steamrolling humans. He grows visibly book to book.

Urara — The oni ayashimon whose ambition drives the plot. She's tiny and looks harmless in human form, which is exactly the joke: she's the boss, and Maruo is her weapon. Their dynamic — a scheming demon strategist paired with an earnest human bruiser who treats yakuza life like a battle manga — is the engine of the series.

Doppo Akari — The looming final antagonist. He controls Kabukicho and operates at a power level the story explicitly frames as beyond Maruo's current reach, which is why Maruo needs more training before he can even attempt the fight. He's the wall the whole series was building toward — and the wall it never got to break.

What I Love About It

What stuck with me is how honest the premise is about being a shonen fan. Maruo isn't isekai'd into another world or handed a magic power. He read manga, believed in it, and physically trained until reality bent — and the tragedy underneath the comedy is that even then, he had nobody to fight and nowhere to belong. Urara's underworld doesn't just give him strong opponents; it gives him a place where his weird, all-consuming devotion to manga heroics finally means something. As someone who used those same heroes as a shield growing up, that hit a nerve no flashier series has.

And then there's Kaku's action. You can feel the same directness here that makes Hell's Paradise land — the panels are clean, the hits read instantly, and the choreography keeps inventing. Reviewers single out the Kori Hotels battle against the tanuki and kitsune as the most creative fight in the run, and it's genuinely the kind of sequence where you understand the geography and the stakes without needing the dialogue. For a series this short, the craft per page is high.

Memorable Scene ⚠️ Spoiler Warning

The image I can't shake is the ending — because of what it isn't. After three volumes of Maruo climbing the underworld ladder, beating Kotton, absorbing the Todoroki Alliance under Urara's banner, the story finally squares him up against Doppo Akari, the one opponent strong enough to be the wall every shonen needs. Maruo realizes he has to get stronger first. He commits. The series poses the fight.

And then it just... stops. Ayashimon was cancelled at 25 chapters, and volume 3 closes right as the Maruo–Doppo confrontation is about to begin. Reading it, you can feel the exact shape of the great arc that was supposed to come next, hanging there unfinished. It's a strange, haunting way to remember a manga — not for a payoff, but for the silhouette of one. Kaku reportedly ended it on his own terms after wrestling with anxiety, which somehow makes the cut-to-black feel even more like a real goodbye than a cancellation.

Pros & Cons

Pros:

• A genuinely great hook — manga-hero otaku vs. yokai yakuza — executed with Kaku's clean, kinetic art.
• Short and complete to read: 3 volumes, no ongoing wait.
• Maruo is a likeable, distinctive lead with clear book-to-book growth.

Cons:

• It was cancelled. The story ends on a cliffhanger, right before its biggest fight, with the central goal unachieved.
• The premise had room for so much more than 25 chapters allowed.
• An unfinished story isn't for everyone — if a cliffhanger ending with no resolution will frustrate you, this one genuinely doesn't pay off, and that's a fair reason to skip it.

Is Ayashimon Worth Reading?

Yes — with eyes open. It's a sharp, energetic appetizer from one of Shonen Jump's most interesting action artists, and at three volumes it costs you almost nothing to try. Just know going in that it stops mid-climb rather than landing a finish. Read it for the premise, the art, and Maruo, not for a conclusion.

Who Is This Manga For?

• Fans of Hell's Paradise (Jigokuraku) who want to see more of Yuji Kaku's range.
• Readers who like supernatural-meets-yakuza action with a fast, clean style.
• People who enjoy short, low-commitment manga — three volumes in a sitting.
• Anyone who grew up taking shonen heroes a little too seriously and wants to see a character who did the same.

Similar Manga

Title	Its Approach	How Ayashimon Differs
Hell's Paradise (Jigokuraku)	Kaku's longer, darker survival-action masterwork with a finished story	Ayashimon is lighter, faster, and built on a yakuza-underworld comedy hook — but unfinished
Dorohedoro	Surreal, grimy supernatural action where humans and magic-users collide	Ayashimon is cleaner-lined and more conventionally shonen in structure
Tokyo Ghoul	Supernatural beings hiding inside human society and its power structures	Ayashimon plays the same idea for yakuza adventure rather than tragedy

Official English Translation Status

Ayashimon is fully available in English from VIZ Media. All three volumes were released in 2023 (Vol. 1 in March, Vol. 2 in June, Vol. 3 in August), so the complete series is in print and digital.

Where to Buy

Read the first volume. If it doesn't hook you, put it down. It'll hook you.

Start with Volume 1 →

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