bsd and enstarrie diesease

I'd like to start with these panels from the manga, chapter 77:

Together with this one from chapter 105:

I think these panels convey the core message of the Mersault arc very well and its goal: Everyone is just human, no matter how smart. And humans are capable of amazing things and even moreso if they come together. This is the greatest difference between Fyodor and Dazai who have been countless of times painted and stated as each other's equals - yes, they are intellectually of a level most can only dream of, only rivaled by Ranpo, but unlike Fyodor, Dazai has learnt to trust humans and understands their bonds to each other.

Fyodor doesn't.

It's a message that is heavily implied and then outright stated by Dazai in the last episode:

The reason why Fyodor fails is that he doesn't trust in people and because he doesn't understand humans in that regard - he thinks that he is above this concept, thinks he can manipulate them and that they're just pawns. It's shown in the way he talks about Sigma, it's shown in the fact that he chose to use Chuuya who is Dazai's partner against Dazai to dangle him in front of Dazai and it's shown when he mocks Dazai for not being "able" to use a "gravity manipulator" and drops the famous line of them having a "shallow bond".

Fyodor is arrogant and very confident in his own abilities, including the one to control those around him. That's what makes him slacking though, he can't comprehend that a plan that relies on a bond and trust would be able to deceive and defeat him and the closer he gets to his goal, the less he cares. That's why he allows Dazai this last speech in 109 too, he doesn't think anything can defeat him. Dazai is at his wit's end, Fyodor is the winner. There's no way that Dazai has a backup plan, Fyodor is a genius and he already thought of everything that could possibly be, so there's no way, right?

Mersault always was about showing what humans are capable of and what they can achieve and that trusting in your allies, in your bonds with the people you love, makes you more capable and achieve higher goals. And it's exactly what happened.

Dazai states that he doesn't have control over all things, that he had a lot of uncertain cards. But he trusted in his allies and it pays off. He wins not because he has it all figured out from the start and a backup plan for the backup plan of the back-p plan, he did his part of the plan and adjusted to the scene and left the rest in full trust with his allies.

This pilot stabbing Fyodor worked because Dazai trusted in the agency and Ranpo and them taking over control the vampires in time. And the rest of the Mersault story before all this?

That brings me to my next point, actually. We learn in the episode that it was all a SKK scheme:

Now, some people were unsatisfied that a plan that simple couldn't fool Fyodor, but I think that is exactly the point of it. Chuuya is a great actor (in Stormbringer he fools with grief and shock Albatross in thinking he saved the in two halves separated Doc for example) and the simplicity of this plan is what makes it so good against Fyodor - why would he assume that the great Dazai, his intellectual equal, another genius, would go through with such a plan?

And it's even better because it isn't actually Dazai's! Now, I have seen a lot of people talking about this and I admit that I assumed the opposite originally as well, that this was all Dazai's scheme, but thanks to a moot I took a closer look on the story-telling and I realized something:

Dazai describes here the moment he realized that Chuuya is on his side in my opinion. This wasn't a "Dazai orchestrated the whole thing and sent Chuuya a text to haul his ass over to Mersault" because it doesn't fit with the storyline. Especially the speech in chapter 101 stands out here - a lot of people are making jokes about how weird and gay of a plan the speech is, but I actually think, based on the situation and the voice acting from Mamoru Miyano, that this goodbye speech is a genuine one.

The speech in 101 seems very genuine down to the point of his fake goodbye in the end, meanwhile the tone of a similar speech in 109 has completely shifted.

And what happened between 101 and 109? Exactly. The elevator.

So, what I'm thinking is this: Dazai saw that Fyodor had Chuuya under control and he knows his partner, he can't quite believe that Chuuya would get himself captured, it's gotta be a plan, right? Soukoku isn't actually the brains-and-brawn duo even though everyone thinks that, but Dazai knows how capable and smart Chuuya is. He hid Arahabaki from him and figured out Rimbaud after all.

But still, there is this bit of doubt nurtured by fear - he trusts Chuuya, but what if this isn't his Chuuya? So his goodbye speech is both:

An attempt to snap Chuuya out of it, an attempt to communicate with him, the hope that carries him because this is his partner, right? Stupid Chuuya that always fights and always clings to life and knows to appreciate it a lot more than Dazai.

But also a genuine goodbye, just... in case. Because he could never forgive himself if he doesn't say goodbye to Chuuya, JUST IN CASE. He trusts and believes in Chuuya, but he can't not say goodbye to him, just in case that Fyodor really got Chuuya.

And then the elevator scene happens and Dazai realizes: He only has one way of surviving, but he will not drag Sigma into this, not if he can help it. And he made a promise to him, after all. So, Dazai pushes Sigma out, makes sure that Sigma is alive like he promised. Then he keeps falling.

The only one that can save him now is Chuuya and Dazai decides to trust him. If this is his Chuuya, Chuuya will save him. Because that is what they do: Soukoku come to each other's call, they trust each other with their life and in return get that life saved by the other.

And if this isn't his Chuuya? Well, then Dazai died for the sake of the agency and he probably thinks that this is a good way to die, too.

But he doesn't die. He gets saved by Chuuya of course, how could he have ever considered something else? Chuuya came to his help and he has a plan. So, now all Dazai has to do is play along, just like in old times.

I wanna talk about this specific part of 109 too - I saw people arguing that the fact that Chuuya has been acting all the time made the scenes less impactful for the plot or their bond, but I actually would argue the opposite. Like I just laid out, in my opinion he only learnt just before this that Chuuya is on his side. That means, they don't have an actual plan that they discussed before, but they're good, they're Soukoku - we have seen in Dead Apple during the Dragonhead's Conflict and in the Dragon fight 6 years later what they are capable of without much communication.

But this is not only a way to show off their flawless communication and synchronization again, it also shows us something that we always knew but that is now plainly laid out: Dazai trusts Chuuya with his life. He trusts Chuuya to shoot, but not kill him.

Truly, you could say:

"The core characterization of Dazai and Chuuya's partnership is based on pure trust where both of them are capable of leaving each other's life on the other's hand without a second thought or doubt." - from the Dead Apple guide book

Chuuya acting from the very beginning as vampire and Dazai finding out along with a leap of faith and them proving once again the close bond they share is exactly the way this arc was supposed to go and the fact that it was predictable in that sense doesn't make it bad writing, in contrary. Asagiri set up and delivered the message of the arc extremely well, the arc had a clear red string following through all of it.