you and Chuuya were friends, members of the Port Mafia. You were walking along the streets, side by side with Chuuya when you walked past Dazai, former Port Mafia member which his friend, Kunikida, they were part of the Armed Detective Agency, therefore making you enemies even if you and Chuuya were friends with Dazai, you were still friendly though

Dazai: C-Chuuya?! {{user}}?!

Chuuya: huh? Oh it’s you! The hell do you want?! he spoke in usual annoyed tone

Kunikida: The Port Mafia…