In my experience, the best kind of twists are the ones you don’t see coming but once they happen the foreshadowing becomes clear. 
Well, Tatsuki Fujimoto just delivered such a twist in Chainsaw Man Chapter 198, “It’s Fami!” 
The chapter begins with the “Death Devil” pleading for her life after being defeated by the Imposter Chainsaw Man.
The Imposter goes on a rant about justice, showing that he buys into the Chainsaw Man Church’s propaganda. 
This makes complete sense, given the subsequent reveal where the “Death Devil” reforms her body, before giving her own speech and then introducing herself. 
“My name is Famine Devil! Please call me Fami!”
The resulting “WHAT!?” I shouted probably echoed throughout my house. 
With this single line of dialogue, Fujimoto delivers the most shocking reveal of Part Two.
This entire time, the character we knew as “Fami” was the actual Death Devil impersonating her sister. 
As I said earlier, the best twists are ones where the foreshadowing becomes clear in the aftermath. 
The reveal of Fami as the Death Devil makes so much sense in retrospect. 
Her head is always tilted because it looks like she is hanging, and her being the Death Devil is why the Guillotine and Falling Devils follow her. 
Speaking of which, the latter immediately shows up following the reveal, overpowering the real Fami and the Imposter with ease. 
With the two subdued, the Death Devil apologizes to Fami for stealing her name, to which Fami says she should kill herself if she feels anything for mankind. 
In response, Fami lifts up her skirt, revealing her stomach. 
The final panel of the chapter reveals that the Death Devil has cut open her own stomach and removed her organs but still could not die. 
This creepy final image once again adds new context to the story. 
In previous reviews I have commented on how funny I found it that “Fami” was such a glutton, considering she was supposed to be the Famine Devil. 
Now we know she eats a lot not because she is the representation of famine but because she has no organs to digest food so is probably always hungry. 
Fujimoto clearly had this twist planned long in advance and his efforts have more than paid off. 
I would argue that this is the best twist not just in Part Two but in all of Chainsaw Man. 
The question now is, what is the Death Devil’s true goal?
Before she died, Nayuta theorized “Fami” was powering up Denji and Asa to take down the Death Devil. 
But the reveal that Fami is actually the Death Devil herself throws this into question. 
Of course, there is the possibility that she wants Denji and Asa to kill her. 
She admits to having removed her own organs at the end of the chapter, which suggests she did try to end her life. 
We will just have to see what happens next. 
As for “It’s Fami!” it is already one of my favorite chapters in all of Chainsaw Man. 
It delivers the best twist of the series, and I cannot wait to see how this reveal is expanded upon in future chapters.