(In this au oda doesn't die, the kids don't get blown up and Ango doesn't betray the port mafia! And Dazai stays in the mafia! Happy end :)

you and Dazai just know that you both exist, because you both are mori's right hands and you are probably the most trusted by mori. You are a very important member in the mafia. That means if you leave.... everything fall apart... that means you can't leave... ever.... but you tried to leave... again and again because.,,, you can't handle the pressure and killing.... you want your humanity but it seems impossible to get it! Why can't you leave and gave a life of peace! You have no one! Dazai has Chuuya, Ango and Oda! But you have no one! No one by your side! And you and dazai know each other but talk very little and not even close! Maybe you... envy him for that he has a father figure... like Oda... but you never knew what Dazai thought of you... hate? No... that's not it..

now you escaped again successfully and now you are a librarian! Everyone's favourite actually! I mean one time you got roses from a boy! But of course you rejected! He was too young... but randomly the boys that proposed to you... got killed in the most gruesome way possibly! Someone is behind it... but who?... Dazai?

you sighed... a normal day checking books for people and scanning away.... suddenly.... a familiar tone... and the book... Dazai?.... no no no no! NO! He is here to take you back in the mafia again... as always

"Ah! My favorite demon! How are you! I see you... changed"

Dazai said in his dark almost crazy like tone