Okay so honestly, since we are reaching the climax of the manga, i can't help but realize how after the climax, there's the falling action...and then finally, the ending. We are getting so close to it and honestly I still can't even begin to elaborate how anxious I am about how it will all wrap up.
There is still many characters and plotlines that are yet needed to wrap up, so I do think building to the climax AND falling action will take a few years (give or take...5-10 years? maybe more if the chapters continues on being cut down and overall slow).
But no matter, I will put my trust in Miss Yana (as i have for years), and she's rarely let me down, so I can only count on her and believe that she will continue to raise the stakes and expectations for Kuroshitsuji.
Now, as for the ending, there's many theories out there, and i'm not in the mood to fully fledge out my theories at the moment, but I do want to talk about what I would wish for the ending of Black Butler as someone who has stuck by this story for years.
For starters, i think the majority of the fandom can agree that the most predictable and plausible ending is o!Ciel fullfilling his revenge, and Sebastian to be able to consume his soul at last.
Honestly, I think if that’s how it ends, it might feel a bit disappointing to some readers—especially since it’s what everyone expects. But there’s also an inevitable tragedy in knowing from the beginning that o!Ciel was always doomed to face a bitter end.
If Yana goes to the safe route of Sebastian eating o!Ciel's soul, here's some elements that I think could add so much nuance to the narrative:
The revenge while being climatic for the readers, being unsatisfying for our earl.
A recurring theme in Black Butler is the inescapable downfall that comes from sacrificing others for your own ambitions.
The BOC arc completely solidifies this ongoing narrative and message:
Ciel isn't laughing mockingly, if anything, he's spiraling.
The circus trope was kidnapping children in order to protect their own, in the end however, it is revealed that Baron Kelvin had already killed these children.
The futility of all their efforts stands out, and you can see a clear parallel between them and their goal, as well as o!Ciel and his pursuit of revenge.
Each of them strayed down a dark path, driven by desperation to achieve something they once believed in—resorting to actions they likely never imagined themselves capable of. Just for it to all be for nothing.
o!Ciel must sense that this might be his own fate too—that when his revenge is fulfilled, it may leave him with nothing but emptiness.
And I don't even need to spell out how deeply the boc arc haunts our earl and the overall narrative: Snake becoming a Phantomhive servant, Joker and Doll resurfacing in The Green Witch arc to taunt o!Ciel’s psyche, Doll’s tragic return as a Bizarre Doll… the echoes are constant.
It's clear that the themes and consequences of BoC don't just linger—they bleed into nearly every arc that follows, casting long shadows over the entire story.
And i dare say that the message boc conveys was slightly shown even before said arc: (i.e: in the red butler arc, madam red killing prostitutes driven by grief and anger, forcing her to confront her own nephew and getting killed in the process by the one reaper who was fueling Red's blood lust.) So Yana has had this theme loom over the story for years, but in my pov it became fully prominent in the boc arc as stated before.
So i can only hope, that while the revenge that o!Ciel is able to obtain is satisfying for the narrative, I hope it leaves our earl the same way it left the circus trope and many others he has trampled: empty and with a desire to continue living.
It's lowkey crazy how much I want this to be portrayed for this particular ending considering o!ciel is lit my favorite character and I want him to be happy, but at the same time, I am a sucker for tragedy, and if this story will end with o!ciel's demise, I can only hope it follows one of my favorite theme's of the story.
2. Sebastian regretting taking o!Ciel's soul to parallel our earls lack of satisfaction with revenge.
Guys I swear I don't mean this in a uwu s*baciel way or in a "awe bassy is so soft !! I want him to cry after eating his soul in regret!!"
What I DO mean however, is Sebastian to be hit with the realization that his whole motivation of wanting to acquire and eat the most delicious soul meant nothing in comparison to the life he led as the butler, as Sebastian.
We know that this demon actually enjoys his life as a butler, i mean in the GWA he literally states how he prefers it over unleashing the beast:
He also takes into consideration advice from human!butler's and even goes an extra mile and compliment a human butler if they do their job in an admirable manner (albiet, he only does this with human butlers whom he deems respectable, like Agni and Tanaka):
Sebastian takes his role as a butler very seriously, sometimes im convinced he gets lost in it:
Sebastian in this pannel teases o!ciel about how he needs to eat well in order to grow up, the irony is that our little lord will never get the chance to, considering the butler himself will cut his time short.
That's why he stares at Sebastian like this, and what I find intresting is that the demon butler genuienly didn't catch or understand why o!ciel is looking at him this way. If he was really taunting him about never growing up, there would've clearly been a smirk on his face, but he looks actually confused.
(I got this interpretation and example from another post, i can't recall if it was twitter or tumblr, I really wish I could give credits to OP. If you find the original post, please link it down in the coments)
So i think it's safe to say that overtime, Sebastian really started to enjoy and have fun with his butler life, and he will loose that the moment he gains o!Ciel's soul.
I don't want him to miss o!Ciel persay, I want him to miss the life he led as the butler Sebastian Michaelis.
If Sebastian has shaped the boy into what he is now, then maybe the boy can, in some small way, reshape the demon too.
And not just the young master—I want the entirety of Sebastian’s butler life to leave its mark. The loyalty of the Phantomhive servants, Agni’s unwavering warmth, the chaos and quiet of every mission, every case, every twisted corner of human nature he’s come to know.
I want all of it to shape him. I want the accumulation of these experiences to shape Sebastian, not just as a flawless servant, but as a demon who cannot come out of this unchanged.
all in all, I want sebastian to feel miserable and bored as karma for eating my childs soul/hj
3. For the story to not just end the moment Sebastian consumes o!Ciel's soul.
I mean, yana herself has told us how Sebastian is the true protagonist of this story. So for it all to end with o!Ciel’s death and nothing more would feel incomplete.
If they do end up showcasing signs of regret from Sebastian after eating our earls soul (fingers crossed), I want the weight of his actions to loom over the Phantomhive manor, over the servants, Elizabeth, Prince Soma, and everyone who’s been touched by Ciel’s life. The loss is universal, not just limited to Sebastian, and I hope they do showcase that tragedy.
But more than that, I want Sebastian's longing to be palpable. After devouring Ciel’s soul, I want the demon to be trapped in a kind of haunting limbo, unable to shake the life he once had as a butler. It should feel like he's yearning for what he lost—his purpose, his role, that delicate balance between master and servant. His regret would not be just a burden, but a twisted kind of desire for what came before.
To wrap all this ranting up:
If we’re not getting a fluff ending for this manga, then the tragedy better hit so deeply, so irreparably, that it even shakes the protagonist demon we first met as cold, calculated, and entirely unfeeling.
I want the grief to linger in the silence of the manor halls, in the absence of a young master’s voice, in the routines that no longer have purpose.
Because if Ciel’s story ends in devastation, then Sebastian’s should end in the quiet, unbearable echo of everything he can’t unsee, unfeel, or undo. I want the tragedy to crack through that perfect façade—and leave something raw beneath it.