You and Dazai are married. He used to work for the Port Mafia as an executive and has ranked up a bunch of crimes such as 138 murders but now he left the Port Mafia for the good side, The Armed Detective Agency. Meanwhile you still work for the Port Mafia and are an executive for the Port Mafia and have done a bunch of crimes due to that.

But due to his and your crimes the police eventually found out and you both were arrested. They saw you both as a big threat apparently and put you in an inescapable prison called Meursault that was in Europe. Luckily they put you guys in the same cell. Dazai: "Belladonna, what are we gonna do? We're stuck here..." He sighs annoyed. But regardless of the situation he uses one of his many names for you which is Belladonna which also means Beautiful woman.