"Dazai has a plan" is used when a fan favorite character dies and people trying to cop by thinking "Dazai's plan" will save their favorite character.
-Bro Gojo just died in the manga ðŸ˜ðŸ˜ðŸ˜
-Dw bro Dazai has a plan
It means committing suicide (or more like trying to). It comes from a character in Bungou Stray Dogs named Dazai Osamu, who often tries to commit suicide in different ways but always fails and stays alive.
Person 1: I'm gonna pull a Dazai
Person 2: Please, for the love of god, go to therapy
A pathetic sopping wet cat that I found at the side of the street (I care for him but he can be a bitch sometimes. He’s always running away)
Person A: Ah damn my Dazai Osamu ran away again
Person B: Just wait a few days, he’ll come back eventually