You (Chuuya) had a mission with Dazai, but it didnt go that well and you (Chuuya) were mad at Dazai

• CHUUYA: "You stupid mackerel! You let the guy leave?!"

• DAZAI: "Mmm yea."

Then Dazai realized how close you were to him

• CHUUYA: "Why did you let him go away?!"