How Did Aki Become the Gun Devil in Chainsaw Man?

How Did Aki Become the Gun Devil in Chainsaw Man?

Aki is one of the main supporting characters of the Chainsaw Man manga and anime. A curious man, Aki was initially very antagonistic towards Denji but would later become his close ally. Although the Chainsaw Man manga is still ongoing, Aki’s story is over, but that won’t stop us from discussing his story here. In this article, we are actually going to tell you how Aki’s story ended, as you are going to find out how Aki Hayakawa became the Gun Devil in Chainsaw Man and what happened to him.

During the Gun Devil Arc, Aki finally faced the Devil that killed his family but instead of avenging them, Aki was killed by the Gun Devil as well and in an ironic twist of fate, he was possessed by it to become the Gun Fiend. He died while protecting Makima from the Gun Devil. As the Gun Fiend, he was ultimately killed by Denji in a heartbreaking scene.

The rest of this article is going to focus on the character of the Gun Devil and how his story is tied to Aki’s story in the manga. These intriguing characters have been featured a lot in the first part of the manga, so we are going to bring you as many details as possible so that you know everything about them. If you haven’t read the manga, we have to warn you that there are going to be spoilers present in this article.

How did Aki become the Gun Fiend in Chainsaw Man?

A principal antagonist of Part 1, the Gun Devil (or simply the Gun) is one of the most powerful Devils in the Chainsaw Man universe. During this short time, the Gun Devil uses its weapons and kills anything that has the misfortune to get in its way. The death toll is counted in thousands or even millions in some cases. Countries like the United States and China have shared their remains and use them as deterrents. In addition, if a Devil absorbs a piece of the Gun Devil, similar to a ball, its power increased ten times. The Devil Hunters thereby attempt to reunite its parts, which attract each other and locate the Gun Devil to eradicate it permanently.


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In the past, the Gun Devil was responsible for killing Aki Hayakawa’s parents and younger brother, thereby orphaning the future Devil Hunter. The Gun Devil didn’t target his family specifically, but they died as collateral victims of another attack. After the attack on November 18 at 10:00 a.m. by the Gun Devil that ravaged the whole world for five minutes and killed Aki Hayakawa’s parents and brother, he pledges to become a Devil Hunter to take revenge on the latter. He makes a contract with the Fox Devil before being introduced to Himeno who has just lost her mission partner as a replacement. She trains Aki Hayakawa, who, over time, adopts some of her bad habits like smoking. Later (the exact date is unknown), Aki Hayakawa becomes a member of the Anti-Devil Special Unit 4.

The Gun Devil Arc was a major arc from Part 1 of the Chainsaw Man manga and it was the story in which the Gun Devil finally appeared and was the principal antagonist, although he was mentioned earlier on several occasions before. On September 12, 1997, the Japanese city of Nikaho in the Akita Prefecture experiences a 12-second Gun Devil attack. When he appears, his ability to fire bullets is immediately put into action. As he destroys villages and massacres their inhabitants, the Gun Devil draws nearer to Makima. Makima may see it from a distance of 500 kilometers away. The Gun Devil comes to a stop and then turns to fire at Makima.

Just before being shot, Makima unleashes her power. Nevertheless, the Gun Devil kills Makima and Aki, who attempted to save Makima from death by setting aside his own vengeance in order to maybe save her. Makima had just recorded her 29th kill. Makima combines the abilities of both the Angel and Spider Devils, as well as the agreements she has with Yutaro Kurose, Akane Sawatari, Michiko Tendo, and Aki Hayakawa, to defeat it.

What happened to the Gun Fiend in Chainsaw Man?

Nevertheless, Makima “failed” to destroy the Gun Devil. Namely, Aki Hayakawa’s corpse was infested by the Gun Devil’s remnants, which ultimately turned Aki into the Gun Fiend in one of the most heartbreaking and ironic moments of the whole series. The Gun Fiend, now an enemy, moves swiftly toward Aki’s residence and knocks on the door. Makima tells Denji, who has no clue what is going on, to open it, but the Gun Field shoots him in the stomach immediately after.


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A significant amount of Aki’s apartment is destroyed in the process, while Denji and Power are catapulted into the air in the direction of the attack. The Gun Fiend then engages Denji in combat, completely destroying the neighborhood in the process and injuring several bystanders as well. In the process, Aki remembers the snowball fight he had with his younger brother just before his family was killed by the Gun Devil, but this time – in the vision – it is Denji and not his younger brother he is playing with.

After taking blood and hearing pleas for assistance from the locals, Denji eventually kills the Gun Fiend and defeats him. This happened because Aki had a second vision of Denji crying, which is why he ultimately gave up on fighting him, because he both remembered his little brother, and considered Denji a friend. Still, despite that, it seems that this was not the last we’ve seen of the Gun Devil, but he has not appeared since.

On the other hand, Aki Hayakawa died twice in the process. His human body dies when he was killed by the Gun Devil, whereas he – as the Gun Fiend – died after being killed by Denji during their fight. This is why the story of the Gun Devil is intrinsically connected to Aki’s story and knowing all of these facts is vital to understanding both of these characters.

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