#at best: we have an scene where aku thinks his life is disposable and that he was a nuisance. and atsushi reassures him with the

[hesperidia]

On the topic of Dazai finding out Akutagawa died:

It's probable that he absolutely knows, finding out while in Mersault. It would make a lot of sense if Ango notified him first thing (given that Ango was also the first person Atsushi told about what happened at the ship). Another situation would be Ango hiding this information from him in order to not give him more baggage while dealing with Fyodor, but this seems unlikely.

Dazai would feel guilty i think, because why would he feel "happy" that Akutagawa is not killing anymore if he didn't care at all about him?

He doesn't know Akutagawa comes back. And he's not going to make it to Japan in less than 2hrs, so he will find out he's alive way after the rest of the cast (unless he and Chuuya communicate with Mori or Ango in the meantime).

So, i think Dazai would not have the guts to face Akutagawa afterwards, because he's deathly allergic to admit he ever fucked up. There should be a re-encounter, and an apology, but it should not be warm. though it probably would be and i'd hate that