With the release of Chainsaw Man chapter 205, the manga finally confirmed the identity of the Fire Devil's host. Surprisingly, the revelation gave fans a callback from the beginning of the manga's second part. Additionally, the latest chapter presented Denji with yet another grave choice.
The manga's previous chapter saw Yoru obtain a new weapon and go after the Falling Devil. Meanwhile, Denji faced off against the Fake Chainsaw Man. Just as he defeated him and freed the people infused with him, the Fire Devil approached Denji, asking him a peculiar question.
Disclaimer: This article contains spoilers from the Chainsaw Man manga.
Chainsaw Man chapter 205: Falling Devil stands in the way of Chainsaw Man

Chainsaw Man chapter 205, titled Who?, picked up from where the previous chapter ended, as the Fire Devil asked Denji if he could recognize the face of the Fake Chainsaw Man. When Denji seemed confused about the person's identity, the Fire Devil took it upon himself to give him a history lesson.
Once, there was a pair of kind-hearted twin brothers. They found the injured Fire Devil and took him in, saving his life. While treating his injuries, the twins often told the Fire Devil about Chainsaw Man. According to them, even a devil could become a symbol of hope—as long as they had justice in their heart—like Chainsaw Man. With that, the twins urged the Fire Devil to join them in doing the right thing.

Empathizing with their message, the Fire Devil took action and made contracts with those who had justice in their hearts, granting them the ability to transform into the shape of their justice. The Fire Devil also remembered how proud the twins looked after saving someone for the first time using the Devil's powers.
However, their fates took a drastic turn after the Chainsaw Man appeared. During Chainsaw Man's battle with the Cockroach Devil, the devil grabbed the younger brother. Instead of saving the younger brother, Denji prioritized saving a cat. The older brother idolized Chainsaw Man, yet the Devil betrayed him. Hence, he lived for revenge on Chainsaw Man and turned into the Fake Chainsaw Man.

The Fire Devil asked Denji if he remembered his face. As expected, Denji hadn't paid attention to the person he betrayed. While it was embarrassing, the Fire Devil understood Chainsaw Man's actions—after all, he was a devil. Chainsaw Man asked the Fire Devil if he wanted him to apologize. Surprisingly, that's not what the Fire Devil wanted, and he presented Denji with two options again, asking him not to make the same mistake again.
Just then, Chainsaw Man chapter 204 showed a building crash behind Chainsaw Man on Yoru. While stuck under the rubble, she told Chainsaw Man she hadn't lost yet and asked him if he wanted to save her. Just as Chainsaw Man agreed that he wanted to save Yoru, the Falling Devil appeared before him, keeping him away from the War Devil.
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