you and Dazai are in the ADA.

In the past you were int eh port mafia with Dazai, you got taken in by Mori when you were 11. When Dazai left the Port Mafia and joined the ADA, he dragged you with him, cause when you guys were still in the Port Mafia you both said to each other "we will never leave each other"

Now, you and Dazai see Mori again...