Kaiju No 8 Season 1 Review: The Shonen Hit That Refuses to Play It Safe

If you have been sleeping on kaiju no 8 season 1, consider this your wake-up call. This 12-episode run from Production I.G. arrived in Spring 2024 and quietly became one of the most talked-about anime of the year. But does it actually hold up, or is it just hype? Here is my honest take after watching every episode.

Short answer: it is very good. Long answer: keep reading, because the reasons why are more interesting than you might expect.

If you want to watch anime online, head over to 9anime-tv.pro and catch kaiju no 8 season 1 right now. For more anime reviews and guides, check out the 9anime-tv.pro blogs.

What Is Kaiju No 8 Season 1 About?

The setup is deceptively simple. Kafka Hibino is a 32-year-old man working the world’s most depressing job: cleaning up kaiju corpses after battles. He dreams of joining the Anti-Kaiju Defense Force alongside his childhood friend Mina Ashiro, who has already become a celebrated captain. Life has not gone according to plan.

Then a parasitic kaiju crawls down his throat and changes everything. Kafka can now transform into a monstrous humanoid creature, designated Kaiju No. 8 by the Defense Force. The twist? He is also trying to join the very organization that would eliminate him if they found out.

It sounds like a classic shonen premise, and in some ways it is. But the execution keeps things fresh in ways the genre has not seen in a while.

Kaiju No 8 Season 1 Characters: Why the Cast Actually Works

The single biggest strength of kaiju no 8 season 1 is Kafka himself. He is not a hot-headed teenager screaming about surpassing his rivals. He is a tired adult in his early thirties who has failed the Defense Force exam so many times that hope has basically given up on him. That is a different kind of protagonist, and it hits differently.

Kafka is funny, warm, occasionally a complete disaster, and deeply selfless. When he gets his power, he does not use it for glory. He uses it to protect people around him, even at great personal risk. That selflessness is what makes him easy to root for.

The supporting cast fills out nicely around him:

• Reno Ichikawa starts as a younger colleague and becomes Kafka’s most sincere ally. Their friendship feels earned, not manufactured.
• Kikoru Shinomiya is a prodigy dealing with the pressure of a legendary father. Her arc quietly evolves across the season and she gets some of the best action moments.
• Soshiro Hoshina is the vice-captain who nearly steals the show. Dual katanas, tactical brilliance, and animation sequences that made my jaw drop. He earns fan-favorite status fast.
• Mina Ashiro is more distant this season, but her relationship with Kafka creates a compelling undercurrent. There is clearly a lot more story here waiting to unfold.

One honest criticism: some of the secondary characters lack real backstory. The Defense Force feels like a large world, but season 1 only scratches the surface of how it actually operates. For a 12-episode run that is forgivable, but it does leave questions hanging.

A Kaiju No 8 Season 1 Review Would Not Be Complete Without Talking Animation

Production I.G. brings their full toolkit to this one. The action sequences are fluid and punchy, with the kaiju designs carrying genuine weight and menace. Studio Khara, best known for supervising the Evangelion films, handled kaiju design and artwork supervision here, and you can feel that influence. These monsters are not generic movie creatures. They are unsettling in very specific ways.

Kafka’s transformation sequence never gets old. The glowing scars, the shift in posture, the eerie calm of Kaiju No. 8’s face. It is visually distinctive every single time.

Not every episode hits the same quality level, though. Episode 3 in particular was widely noted as a low point, with animation that felt noticeably flatter compared to the premiere. The final two episodes, by contrast, are some of the best-looking in the entire season, ramping up the visual fidelity right when the story needs it most.

The character designs drew some criticism for being a little plain compared to other recent shonen. It is a fair point. Nobody here has the instantly iconic visual identity of, say, a Jujutsu Kaisen character. But the expressiveness in Kafka’s face makes up for a lot of that.

The Soundtrack: The Part Every Other Kaiju No 8 Season 1 Review Glosses Over

This deserves its own section because it is genuinely unusual. The opening theme “Abyss” is performed by Yungblud, a British alternative rock musician. The ending theme “Nobody” comes from OneRepublic, the American pop rock band. For a Japanese anime production, recruiting two prominent Western artists for both theme songs is almost unheard of.

It works. “Abyss” captures that restless, determined energy Kafka carries through the whole season. It does not feel like a mismatch. It feels like a bold creative choice that paid off.

Beyond the themes, composer Yuta Bandoh built a layered film score using a group called The Kaiju Band, a project assembled specifically for this anime. The result is a soundtrack that sounds more cinematic than most seasonal anime manage.

How Kaiju No 8 Season 1 Handles the Age Theme Better Than You Think

Most reviews mention Kafka’s age as a fun detail. I think it is actually the whole point of the show.

Kafka represents something most shonen anime never touch: the experience of watching your dream expire. He is not young and reckless. He is someone who has lived with failure long enough that he has started rationalizing it. When Reno shows up and reignites that old goal, Kafka has to decide whether he is too far gone to try again.

That is not a teenage story. That is an adult story wearing a shonen costume. And it lands emotionally in a way that a standard young protagonist simply could not.

The show is essentially arguing that it is never actually too late. Kafka’s body works against him. His age works against him. The Defense Force entrance exam is brutal for someone without the recovery speed of a 17-year-old. And yet he keeps going. That stubbornness, combined with the kaiju power he never asked for, creates a protagonist who earns every win he gets.

The Tokusatsu DNA: What Sets This Anime Apart From Its Competitors

Creator Naoya Matsumoto has openly cited tokusatsu media, especially Ultraman, as a major influence on Kaiju No. 8. Once you see it, you cannot unsee it. The Defense Force in their specialized suits, the kaiju threat as a normal part of daily life, the idea of a human who secretly becomes the thing the world fears. That is deeply tokusatsu in its DNA.

This is a gap most Western reviews miss entirely. Kaiju No. 8 is not just trying to be the next Attack on Titan or Jujutsu Kaisen. It is doing something different: bringing the spirit of live-action tokusatsu into animated form with modern production quality. That is a more specific and interesting goal than “make a cool monster show.”

Kaiju No. 9 and 10: The Villains That Season 1 Barely Scratches

Here is another gap worth addressing. Kaiju No. 9 and No. 10 show up during the Defense Force entrance exam arc and immediately signal that something much larger is happening beneath the surface. These are not mindless monsters. They are intelligent, strategic, and working toward goals that season 1 does not fully explain.

No. 9 in particular is a genuinely unnerving presence. It can speak, it adapts, and it has a terrifying calm that stands in direct contrast to every chaotic monster that came before it. Season 1 gives you just enough of this threat to make you desperate for answers.

That is smart storytelling. The central mystery of why the kaiju are becoming smarter and more organized gives the show a larger scope that goes well beyond Kafka’s personal journey.

Is the Manga Faithfulness Worth Mentioning?

For fans of Naoya Matsumoto’s original manga, the adaptation is respectful and consistent. No significant rewrites, no strange filler arcs crowbarred into the pacing. The anime trusts the source material and mostly just adds visual spectacle on top of what was already there.

If the manga is a page-turner, the anime is the same story with full animation, sound design, and a cinematic score behind every major beat. It does not betray the source, which for a popular manga adaptation in 2024 is genuinely worth noting.

Kaiju No 8 Season 1 Review: Final Verdict

Kaiju no 8 season 1 is one of the best shonen anime of 2024. It takes a familiar genre framework and populates it with an unusually relatable protagonist, strong supporting characters, spectacular animation when it counts, and a mystery layered beneath the action that keeps you hooked all the way to the cliffhanger finale.

It is not perfect. Some secondary characters need more development. Episode 3 is a dip. The character designs play it safer than they should. But none of that is close to enough to undermine what this show accomplishes across 12 episodes.

If you have ever watched a shonen and thought “I wish the hero was a tired adult who has already failed a hundred times,” this was made specifically for you. Watch kaiju no 8 season 1 and then immediately go read what is coming in Season 2, because the cliffhanger is not kind.

Ready to watch? Head over to 9anime-tv.pro to watch anime online and catch Kaiju No. 8. For more reviews like this one, browse the 9anime-tv.pro blogs.

Frequently Asked Questions About Kaiju No 8 Season 1

Is Kaiju No 8 season 1 worth watching?

Yes. Kaiju No 8 season 1 is one of the standout anime of Spring 2024. It combines strong character writing, excellent action animation from Production I.G., and a genuinely engaging mystery that builds across all 12 episodes. Even if shonen is not usually your genre, the adult protagonist angle makes it feel different from the standard formula.

How many episodes does Kaiju No 8 season 1 have?

Kaiju No 8 season 1 has 12 episodes. They aired from April 13 to June 29, 2024, on TV Tokyo. Each episode runs around 23 minutes.

Is Kaiju No 8 similar to Attack on Titan?

There are surface similarities: humanity is under constant monster attack, there is a military organization defending civilization, and the tone mixes serious drama with action. But Kaiju No 8 is notably less dark and more hopeful in its outlook. Where Attack on Titan leans into existential dread, Kaiju No 8 leans into resilience, humor, and the idea that second chances are real.

Who animated Kaiju No 8 season 1?

Kaiju No 8 season 1 was animated by Production I.G., with Studio Khara supervising the kaiju designs. The series was directed by Shigeyuki Miya and Tomomi Kamiya, with scripts by Ichiro Okouchi.

Does Kaiju No 8 follow the manga closely?

Yes. The anime adaptation is faithful to Naoya Matsumoto’s manga with no major rewrites or filler arcs. The anime adds visual spectacle and a strong soundtrack on top of the source material while staying true to the story and characters.

What are the opening and ending themes of Kaiju No 8 season 1?

The opening theme is “Abyss” performed by Yungblud, a British alternative rock artist. The ending theme is “Nobody” performed by OneRepublic, the American pop rock band. Both themes are unusually high-profile Western music choices for a Japanese anime production.

Is there a season 2 of Kaiju No 8?

Yes. Kaiju No 8 season 2 aired from July to September 2025. A conclusion arc for the anime series has also been announced beyond that.