Curate, connect, and discover
It's objectively hysterical that it took Kunikida so long to figure out Dazai was in the Mafia.
For starters, the entire Entrance Exam light novel, he and the president were commenting on how suspicious it was that this man just seemingly had no past at all. and stated numerous times that he thought he was some sort of criminal.
And then there's this scene:
Dazai *randomly gives a detailed run down of the organ trafficking business*
Kunikida: how do you know that??
Dazai: Oh i heard two people talking about it once.
Kunikida:
Kunikida: yes that makes sense.
Or that time when he ran into Akutagawa and electrocuted him:
Aku: yes you are worthy of being Dazai's partner.
Kunikida: "worthy of...?" Do I know you?? Does Dazai know you??
Aku:
Aku: goodbye now.
Like all the clues were there but Kunikida just thought this man was too lazy to have ever really been a professional criminal.
If I had a nickel every time one of Dazai's partners shot him in the head leading to Dazai's "death" only for it to be an elaborate plot to fool the enemy that could only have been achieved with an insane amount of trust and a little bit of luck tbh-
I'd have two nickels.
Which isn't a lot, but it's weird that it happened twice